//www.getgobooth.com/ 必威体育下载 daily 15 2024-08-20 10:33:36 apsoffice@iphy.ac.cn apsoffice@iphy.ac.cn 2024-08-20 10:33:36 zh Copyright ©Acta Physica Sinica All Rights Reserved. 京ICP备05002789号-1 Address: PostCode：100190 Phone: 010-82649829，82649241,82649863 Email: apsoffice@iphy.ac.cn Copyright ©Acta Physica Sinica All Rights Reserved apsoffice@iphy.ac.cn 1000-3290 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1873 Author(s): MA YONG-GE, LIANG CAN-BIN <br/><p>In Ashtekar's formalism, the phase space of general relativity is imbedded into the phase space of complex SU(2) Yang-Mills theory. In this paper, the approach of analyzing local symmetries and constraints in ordinary feild theories is generalized to the complex field theory, the phase space of the Ashtekar formalism is constructed from the configuration space of the self dual Palatini formalism, and the relationship hetween local symmetries of the configuration space and constraints on the phase space is then discussed.</p> <br/>Acta Physica Sinica. 1997 46(10): 1873-1879. Published 1997-05-05 Author(s): MA YONG-GE, LIANG CAN-BIN <br/><p>In Ashtekar's formalism, the phase space of general relativity is imbedded into the phase space of complex SU(2) Yang-Mills theory. In this paper, the approach of analyzing local symmetries and constraints in ordinary feild theories is generalized to the complex field theory, the phase space of the Ashtekar formalism is constructed from the configuration space of the self dual Palatini formalism, and the relationship hetween local symmetries of the configuration space and constraints on the phase space is then discussed.</p> <br/>Acta Physica Sinica. 1997 46(10): 1873-1879. Published 1997-05-05 LOCAL SYMMETRIES AND CONSTRAINTS IN SELF DUAL GRAVITY MA YONG-GE, LIANG CAN-BIN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1873-1879. article doi:10.7498/aps.46.1873 10.7498/aps.46.1873 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1873 1873-1879 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1880 Author(s): ZHAN YONG, BAO JING-DONG, ZHUO YI-ZHONG, WU XI-ZHEN <br/><p>A system which uses the non equilibrium fluctuating energy to do work is considered as a result of Brownian motor derived by both internal and external noises. The corresponding diffusion model including damping force and double noise sources is proposed. Through the analytical calculation and numerical simulation, the mechanism of the directed motion of the Brownian motor driven by multiplicative noise and the effect of damping force on the steady current in the one dimensional inertia ratchet potential are accordingly expounded and analyzed. As a application, the experimental phenomenon of the stepping motion of the single motor protein is explained.</p> <br/>Acta Physica Sinica. 1997 46(10): 1880-1887. Published 1997-05-05 Author(s): ZHAN YONG, BAO JING-DONG, ZHUO YI-ZHONG, WU XI-ZHEN <br/><p>A system which uses the non equilibrium fluctuating energy to do work is considered as a result of Brownian motor derived by both internal and external noises. The corresponding diffusion model including damping force and double noise sources is proposed. Through the analytical calculation and numerical simulation, the mechanism of the directed motion of the Brownian motor driven by multiplicative noise and the effect of damping force on the steady current in the one dimensional inertia ratchet potential are accordingly expounded and analyzed. As a application, the experimental phenomenon of the stepping motion of the single motor protein is explained.</p> <br/>Acta Physica Sinica. 1997 46(10): 1880-1887. Published 1997-05-05 DIRECT TRANSPORTABLE MODEL OF BROWNIAN MOTOR ZHAN YONG, BAO JING-DONG, ZHUO YI-ZHONG, WU XI-ZHEN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1880-1887. article doi:10.7498/aps.46.1880 10.7498/aps.46.1880 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1880 1880-1887 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1888 Author(s): FANG DA-WEI, XIE WEI-JUN, ZHANG SEN <br/><p>The populations of n=17,m=0 Stark states of sodium atom in static electric fields have been obtained by two step excitation using tunable lasers. The lifetimes of some selected Stark states and the influences of blackbody radiation on the lifetimes were measured by using delayed electric field ionization. The measured data were compared with the calculated values. The experimental and theoretical results exhibit following behaviours: The total rates of stimulated emission and absorption transitions induced by environmental radiations are of the same order of magnitude in comparison to those of spontaneous transition for the observed n=17 Stark manifold states at room temperature. And this effect is more remarkable for longer lived states. It, along with the effect of the Stark mixing of l sublevels, will reduce the differences among lifetimes of Stark states in a manifold.</p> <br/>Acta Physica Sinica. 1997 46(10): 1888-1893. Published 1997-05-05 Author(s): FANG DA-WEI, XIE WEI-JUN, ZHANG SEN <br/><p>The populations of n=17,m=0 Stark states of sodium atom in static electric fields have been obtained by two step excitation using tunable lasers. The lifetimes of some selected Stark states and the influences of blackbody radiation on the lifetimes were measured by using delayed electric field ionization. The measured data were compared with the calculated values. The experimental and theoretical results exhibit following behaviours: The total rates of stimulated emission and absorption transitions induced by environmental radiations are of the same order of magnitude in comparison to those of spontaneous transition for the observed n=17 Stark manifold states at room temperature. And this effect is more remarkable for longer lived states. It, along with the effect of the Stark mixing of l sublevels, will reduce the differences among lifetimes of Stark states in a manifold.</p> <br/>Acta Physica Sinica. 1997 46(10): 1888-1893. Published 1997-05-05 INFLUENCE OF ENVIRONMENTAL RADIATION ON LIFETIMES OF STARK STATES IN HIGHLY EXCITED ATOM FANG DA-WEI, XIE WEI-JUN, ZHANG SEN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1888-1893. article doi:10.7498/aps.46.1888 10.7498/aps.46.1888 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1888 1888-1893 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1894 Author(s): LONG DE-SHUN, WANG YAN-SEN, FANG DU-FEI, TANG JIA-YONG <br/><p>Using a simpler calculation scheme, we have investigated the surface penetration barriers and bulk diffusion barriers for oxygen in the simple metals Al,Be,Ca,Mg,Zn and their oxides. The results show that the values of the barriers depend on the crystal structure of the material and on the ability of the lattice to relax during the incorporation process. By comparing the theoretical values of the barriers with the experimental ones, we found that the agreement is basically good.</p> <br/>Acta Physica Sinica. 1997 46(10): 1894-1900. Published 1997-05-05 Author(s): LONG DE-SHUN, WANG YAN-SEN, FANG DU-FEI, TANG JIA-YONG <br/><p>Using a simpler calculation scheme, we have investigated the surface penetration barriers and bulk diffusion barriers for oxygen in the simple metals Al,Be,Ca,Mg,Zn and their oxides. The results show that the values of the barriers depend on the crystal structure of the material and on the ability of the lattice to relax during the incorporation process. By comparing the theoretical values of the barriers with the experimental ones, we found that the agreement is basically good.</p> <br/>Acta Physica Sinica. 1997 46(10): 1894-1900. Published 1997-05-05 CALCULATIONS OF THE SURFACE AND DIFFUSION BARRIERS FOR OXYGEN PENETRATION ON METALS AND THEIR OXIDES LONG DE-SHUN, WANG YAN-SEN, FANG DU-FEI, TANG JIA-YONG 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1894-1900. article doi:10.7498/aps.46.1894 10.7498/aps.46.1894 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1894 1894-1900 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1901 Author(s): FENG REN-FEI, WU SHU-LAN, LIU YING-HUI, JI QING, XU KE-ZUN <br/><p>The high resolution fast electron energy loss spectrum for inner shell 2p electron excitation and ionization of argon has been measured in present work at an electron impact energy of 2500eV and a mean scattering angle of 0°. The ionization limits and effective quantum numbers have been- deduced.- The oscillator strength densities for discrete transitions and two ionization continua were- also- determined.</p> <br/>Acta Physica Sinica. 1997 46(10): 1901-1905. Published 1997-05-05 Author(s): FENG REN-FEI, WU SHU-LAN, LIU YING-HUI, JI QING, XU KE-ZUN <br/><p>The high resolution fast electron energy loss spectrum for inner shell 2p electron excitation and ionization of argon has been measured in present work at an electron impact energy of 2500eV and a mean scattering angle of 0°. The ionization limits and effective quantum numbers have been- deduced.- The oscillator strength densities for discrete transitions and two ionization continua were- also- determined.</p> <br/>Acta Physica Sinica. 1997 46(10): 1901-1905. Published 1997-05-05 STRUCTURE AND OSCILLATOR STRENGTH DENSITIES NEAR LⅡ,Ⅲ EDGES OF ARGON FENG REN-FEI, WU SHU-LAN, LIU YING-HUI, JI QING, XU KE-ZUN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1901-1905. article doi:10.7498/aps.46.1901 10.7498/aps.46.1901 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1901 1901-1905 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1906 Author(s): WANG XIAO-GANG, ZHU QING-SHI <br/><p>We have developed a method to evaluate the effective vibration rotation parameter using the wavefunction from the local mode model, on the basis of the wavefunction equivalence of the two models describing the stretching overtone——the NMDD normal mode model and HCAO local mode model. By using this approach, an improved “α-relation” is derived, which exists among the effective vibration rotation parameters of local mode vibrational state at the local mode limit.</p> <br/>Acta Physica Sinica. 1997 46(10): 1906-1916. Published 1997-05-05 Author(s): WANG XIAO-GANG, ZHU QING-SHI <br/><p>We have developed a method to evaluate the effective vibration rotation parameter using the wavefunction from the local mode model, on the basis of the wavefunction equivalence of the two models describing the stretching overtone——the NMDD normal mode model and HCAO local mode model. By using this approach, an improved “α-relation” is derived, which exists among the effective vibration rotation parameters of local mode vibrational state at the local mode limit.</p> <br/>Acta Physica Sinica. 1997 46(10): 1906-1916. Published 1997-05-05 A LOCAL MODE APPROACH TO MOLECULAR VIBRATION ROTATION SPECTROSCOPY OF LOCAL MODE VIBRATIONAL STATES WANG XIAO-GANG, ZHU QING-SHI 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1906-1916. article doi:10.7498/aps.46.1906 10.7498/aps.46.1906 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1906 1906-1916 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1917 Author(s): LIU SHEN-YE, TEN HAO, DING YONG-KUN, DING YAO-NAN, SU CHUN-XIAO, JIN GEN-ZHI, ZHANG HAI-YING, CHEN YU-TING, ZHENG ZHI-JIAN, TANG DAO-YUAN <br/><p>The experiments used the “Xingguang Ⅱ” laser facility to irradiate gold disks at some chosen angle of incidence. In this paper, we report the absorption and angular distribution of scattered lights of 0.351μm laser light by Au disks. The experiments have shown that the absorption by Au disk is higher than that irradiated with 0.53 or 1.05μm laser light. The angular distribution of scattered lights proves that scattered lights include stimulated Brillouin scattering and specular reflection from critical surface. Based on inverse bremsstrahlung absorption, the absorption obtained by simulation agrees with the experimental results.</p> <br/>Acta Physica Sinica. 1997 46(10): 1917-1925. Published 1997-05-05 Author(s): LIU SHEN-YE, TEN HAO, DING YONG-KUN, DING YAO-NAN, SU CHUN-XIAO, JIN GEN-ZHI, ZHANG HAI-YING, CHEN YU-TING, ZHENG ZHI-JIAN, TANG DAO-YUAN <br/><p>The experiments used the “Xingguang Ⅱ” laser facility to irradiate gold disks at some chosen angle of incidence. In this paper, we report the absorption and angular distribution of scattered lights of 0.351μm laser light by Au disks. The experiments have shown that the absorption by Au disk is higher than that irradiated with 0.53 or 1.05μm laser light. The angular distribution of scattered lights proves that scattered lights include stimulated Brillouin scattering and specular reflection from critical surface. Based on inverse bremsstrahlung absorption, the absorption obtained by simulation agrees with the experimental results.</p> <br/>Acta Physica Sinica. 1997 46(10): 1917-1925. Published 1997-05-05 ABSORPTION AND SCATTERED LIGHT OF GOLD DISKS IRRADIATED WITH 0.351μm LASER LIGHT LIU SHEN-YE, TEN HAO, DING YONG-KUN, DING YAO-NAN, SU CHUN-XIAO, JIN GEN-ZHI, ZHANG HAI-YING, CHEN YU-TING, ZHENG ZHI-JIAN, TANG DAO-YUAN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1917-1925. article doi:10.7498/aps.46.1917 10.7498/aps.46.1917 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1917 1917-1925 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1926 Author(s): FENG XUN-LI, HE LIN-SHENG <br/><p>Using the principle of detailed balance and the evolution of entropy, the stability of a two-level system coupled to a squeezed vacuum via degenerate two-photon processes is investigated. We find that the stability of the system depends on the squeezing parameter M of squeezed vacuum. When |M| is small, the system is unstable, but when M is a very large real number, the system is driven to a stable state but far from equilibrium.</p> <br/>Acta Physica Sinica. 1997 46(10): 1926-1931. Published 1997-05-05 Author(s): FENG XUN-LI, HE LIN-SHENG <br/><p>Using the principle of detailed balance and the evolution of entropy, the stability of a two-level system coupled to a squeezed vacuum via degenerate two-photon processes is investigated. We find that the stability of the system depends on the squeezing parameter M of squeezed vacuum. When |M| is small, the system is unstable, but when M is a very large real number, the system is driven to a stable state but far from equilibrium.</p> <br/>Acta Physica Sinica. 1997 46(10): 1926-1931. Published 1997-05-05 DETAILED BALANCE AND ENTROPY FOR A TWO-LEVEL ATOM IN A SQUEEZED VACUUM VIA DEGENERATE TWO PHOTON PROCESSES FENG XUN-LI, HE LIN-SHENG 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1926-1931. article doi:10.7498/aps.46.1926 10.7498/aps.46.1926 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1926 1926-1931 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1932 Author(s): ZENG XIAO-DONG, LIANG CHANG-HONG, AN YU-YING <br/><p>Based on a rigorous far field solution of the Helmholtz equation, a new method to describe the propagation of the offaxial Gaussian wave is presented. The amplitude and phase distribution, beam spot size, divergence angle, and the relation of the conservation of energy are discussed. It is found that for any Gaussian source the maximum divergence angle is shown to be 65.5.</p> <br/>Acta Physica Sinica. 1997 46(10): 1932-1937. Published 1997-05-05 Author(s): ZENG XIAO-DONG, LIANG CHANG-HONG, AN YU-YING <br/><p>Based on a rigorous far field solution of the Helmholtz equation, a new method to describe the propagation of the offaxial Gaussian wave is presented. The amplitude and phase distribution, beam spot size, divergence angle, and the relation of the conservation of energy are discussed. It is found that for any Gaussian source the maximum divergence angle is shown to be 65.5.</p> <br/>Acta Physica Sinica. 1997 46(10): 1932-1937. Published 1997-05-05 OFFAXIAL GAUSSIAN WAVE ZENG XIAO-DONG, LIANG CHANG-HONG, AN YU-YING 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1932-1937. article doi:10.7498/aps.46.1932 10.7498/aps.46.1932 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1932 1932-1937 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1938 Author(s): SUN ZONG-QI, XU JI-AN, XIE HONG-SHEN <br/><p>A two-dimensional approximation with axisymmetry was used to deal with the thermal conduction inside the high pressure cell . A numerical method, using a microcomputer, to obtain the static and non-steady distribution of temperature was given. The error of calculation in this method was estimated and an approximate analytical formula for the static distribution of the temperature was also given.</p> <br/>Acta Physica Sinica. 1997 46(10): 1938-1945. Published 1997-05-05 Author(s): SUN ZONG-QI, XU JI-AN, XIE HONG-SHEN <br/><p>A two-dimensional approximation with axisymmetry was used to deal with the thermal conduction inside the high pressure cell . A numerical method, using a microcomputer, to obtain the static and non-steady distribution of temperature was given. The error of calculation in this method was estimated and an approximate analytical formula for the static distribution of the temperature was also given.</p> <br/>Acta Physica Sinica. 1997 46(10): 1938-1945. Published 1997-05-05 COMPUTER SIMULATION OF THE THERMAL FLOW INSIDE THE HIGH PRESSURE CELL(Ⅰ) EQUATIONS AND METHODS OF SOLUTION SUN ZONG-QI, XU JI-AN, XIE HONG-SHEN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1938-1945. article doi:10.7498/aps.46.1938 10.7498/aps.46.1938 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1938 1938-1945 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1946 Author(s): WU JIAN-QIANG, LIU SHENG-GANG <br/><p>A new type of slow-wave system (SWS) for the beam-wave interaction——putting a plasma column into a dielectric-partially-filled waveguide, is presented. By use of the linear self-consistent field theory, the interaction of a relativistic electron beam with the wave in the SWS is analysed. Determinative dispersion equations are derived for a thin annular relativistic electron beam propagating through the SWS surrounding and existing inside the plasma column, respectively. These dispersion equations are directly solved numerically, and the cut-off frequency, the operation frequency and the growth rate of the waves are obtained. Finally, the effects of the parameters of the plasma column on them are discussed.</p> <br/>Acta Physica Sinica. 1997 46(10): 1946-1952. Published 1997-05-05 Author(s): WU JIAN-QIANG, LIU SHENG-GANG <br/><p>A new type of slow-wave system (SWS) for the beam-wave interaction——putting a plasma column into a dielectric-partially-filled waveguide, is presented. By use of the linear self-consistent field theory, the interaction of a relativistic electron beam with the wave in the SWS is analysed. Determinative dispersion equations are derived for a thin annular relativistic electron beam propagating through the SWS surrounding and existing inside the plasma column, respectively. These dispersion equations are directly solved numerically, and the cut-off frequency, the operation frequency and the growth rate of the waves are obtained. Finally, the effects of the parameters of the plasma column on them are discussed.</p> <br/>Acta Physica Sinica. 1997 46(10): 1946-1952. Published 1997-05-05 ANALYSES OF BEAM-WAVE INTERACTION IN A DIELECTRIC LINED SLOW-WAVE WAVEGUIDE WITH A PLASMA COLUMN WU JIAN-QIANG, LIU SHENG-GANG 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1946-1952. article doi:10.7498/aps.46.1946 10.7498/aps.46.1946 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1946 1946-1952 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1953 Author(s): LI CHAO-RONG <br/><p>The structures of ZnTe/GaSb, grown by molecular beam epitaxy under different conditions, were investigated by X-ray triple-axis scattering and crystal truncation rod. The sample annealed under Zn flux from surface cleaning temperature to growth temperature had clear interference fringes in the crystal truncation rod scan profile, while the sample annealed under Te flux shows no interference fringes in the crystal truncation rod. Reciprocal space mapping around the symmetrical diffraction reciprocal point 004 and asymmetrical diffraction point 115 showed that the ZnTe epilayers were fully strained to the substrate. Both two-dimensional reciprocal space mapping and transverse scan along direction showed that the sample annealed under Te flux had strong and broad diffuse scattering in this direction. This was attributed to the Ga2Ｔｅ3 formation at the interface. This interfacial phase would enhance the diffuse scattering, blur the interference fringes and roughen the surface and interface. The epilayer thickness was accurately determined to be (210±1)nm by theoretical calculation of the experimental profiles. The surface roughness of the sample annealed under Zn flux, (2.2±0.2)nm, was smaller that of the sample annealed under Te flux, (3.7±0.3)nm.The lateral correlation lengths of the samples annealed under Zn flux and Te flux are (420±10)nm and (30±5)nm,respectively.</p> <br/>Acta Physica Sinica. 1997 46(10): 1953-1960. Published 1997-05-05 Author(s): LI CHAO-RONG <br/><p>The structures of ZnTe/GaSb, grown by molecular beam epitaxy under different conditions, were investigated by X-ray triple-axis scattering and crystal truncation rod. The sample annealed under Zn flux from surface cleaning temperature to growth temperature had clear interference fringes in the crystal truncation rod scan profile, while the sample annealed under Te flux shows no interference fringes in the crystal truncation rod. Reciprocal space mapping around the symmetrical diffraction reciprocal point 004 and asymmetrical diffraction point 115 showed that the ZnTe epilayers were fully strained to the substrate. Both two-dimensional reciprocal space mapping and transverse scan along direction showed that the sample annealed under Te flux had strong and broad diffuse scattering in this direction. This was attributed to the Ga2Ｔｅ3 formation at the interface. This interfacial phase would enhance the diffuse scattering, blur the interference fringes and roughen the surface and interface. The epilayer thickness was accurately determined to be (210±1)nm by theoretical calculation of the experimental profiles. The surface roughness of the sample annealed under Zn flux, (2.2±0.2)nm, was smaller that of the sample annealed under Te flux, (3.7±0.3)nm.The lateral correlation lengths of the samples annealed under Zn flux and Te flux are (420±10)nm and (30±5)nm,respectively.</p> <br/>Acta Physica Sinica. 1997 46(10): 1953-1960. Published 1997-05-05 INVESTIGATION OF THE STRUCTURES OF ZnTe/GaSb BY X-RAY TRIPLE-AXIS SCATTERING AND CRYSTAL TRUNCATION ROD LI CHAO-RONG 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1953-1960. article doi:10.7498/aps.46.1953 10.7498/aps.46.1953 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1953 1953-1960 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1961 Author(s): MENG QING-AN, HU CHUAN-MIN, CAO QI-JUAN, LI ZI-RONG <br/><p>The proton magnetic resonance spectra of 4-cyanophenyl 4′-hexyloxy benzoate (CPHOB) were measured from room temperature to 380K. It was found that the transition temperature from solid to nematic phase was Tｓｎ=347K, and the transition temperature from nematic phase to isotropic liquid Tｎi=359K. The temperature dependence of its order parameter was evaluated. Its mechanism of proton spin lattice relaxation was discussed.</p> <br/>Acta Physica Sinica. 1997 46(10): 1961-1964. Published 1997-05-05 Author(s): MENG QING-AN, HU CHUAN-MIN, CAO QI-JUAN, LI ZI-RONG <br/><p>The proton magnetic resonance spectra of 4-cyanophenyl 4′-hexyloxy benzoate (CPHOB) were measured from room temperature to 380K. It was found that the transition temperature from solid to nematic phase was Tｓｎ=347K, and the transition temperature from nematic phase to isotropic liquid Tｎi=359K. The temperature dependence of its order parameter was evaluated. Its mechanism of proton spin lattice relaxation was discussed.</p> <br/>Acta Physica Sinica. 1997 46(10): 1961-1964. Published 1997-05-05 ORDER PARAMETER AND NMR RELAXATION OF THERMOTROPIC LIQUID CRYSTAL CPHOB MENG QING-AN, HU CHUAN-MIN, CAO QI-JUAN, LI ZI-RONG 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1961-1964. article doi:10.7498/aps.46.1961 10.7498/aps.46.1961 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1961 1961-1964 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1965 Author(s): WANG YU-GANG, KANG YI-XIU, ZHAO WEI-JIANG, YAN SHA, YAN JUN-JUE, YANG WEI-SHENG, ZAI PENG-JI, TANG XIAO-WEI <br/><p>The individual damage on high oriented pyrolytic graphite surface induced by gold ions of 530keV—4.5MeV was studied with scanning tunneling microscope. The hillock-like damage was observed and measured and then the average diameters of the hillocks were obtained. In terms of a modified nonlinear thermal spike model, the diameters of the damage were calculated and the results fit well with the experimental data. The possible mechanism of damage formation is discussed.</p> <br/>Acta Physica Sinica. 1997 46(10): 1965-1971. Published 1997-05-05 Author(s): WANG YU-GANG, KANG YI-XIU, ZHAO WEI-JIANG, YAN SHA, YAN JUN-JUE, YANG WEI-SHENG, ZAI PENG-JI, TANG XIAO-WEI <br/><p>The individual damage on high oriented pyrolytic graphite surface induced by gold ions of 530keV—4.5MeV was studied with scanning tunneling microscope. The hillock-like damage was observed and measured and then the average diameters of the hillocks were obtained. In terms of a modified nonlinear thermal spike model, the diameters of the damage were calculated and the results fit well with the experimental data. The possible mechanism of damage formation is discussed.</p> <br/>Acta Physica Sinica. 1997 46(10): 1965-1971. Published 1997-05-05 SCANNING TUNNELING MICROSCOPIC OBSERVATION OF GRAPHITE SURFACE DAMAGE INDUCED BY GOLD IONS BOMBARDMENT(Ⅱ) WANG YU-GANG, KANG YI-XIU, ZHAO WEI-JIANG, YAN SHA, YAN JUN-JUE, YANG WEI-SHENG, ZAI PENG-JI, TANG XIAO-WEI 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1965-1971. article doi:10.7498/aps.46.1965 10.7498/aps.46.1965 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1965 1965-1971 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1972 Author(s): LING FAN, CHEN XIAO-BING, FU RONG-TANG, SUN XIN, Y. KAWAZOE <br/><p>The nesting of the Fermi surface in a two-dimensional (2D) system is not perfect, which is distinctly different from one-dimensional system. The nesting deviation can heavily suppress the instability of 2D system. In this paper, the effect of the nesting deviation on the Peierls transition is quantitatively studied, and the limit for the nesting deviation, beyond which the Peierls transition is destroyed, is determined. Such a behavior is favorable to get the superconductivity.</p> <br/>Acta Physica Sinica. 1997 46(10): 1972-1977. Published 1997-05-05 Author(s): LING FAN, CHEN XIAO-BING, FU RONG-TANG, SUN XIN, Y. KAWAZOE <br/><p>The nesting of the Fermi surface in a two-dimensional (2D) system is not perfect, which is distinctly different from one-dimensional system. The nesting deviation can heavily suppress the instability of 2D system. In this paper, the effect of the nesting deviation on the Peierls transition is quantitatively studied, and the limit for the nesting deviation, beyond which the Peierls transition is destroyed, is determined. Such a behavior is favorable to get the superconductivity.</p> <br/>Acta Physica Sinica. 1997 46(10): 1972-1977. Published 1997-05-05 PHASE TRANSITION AND NESTING IN LOW DIMENSION LING FAN, CHEN XIAO-BING, FU RONG-TANG, SUN XIN, Y. KAWAZOE 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1972-1977. article doi:10.7498/aps.46.1972 10.7498/aps.46.1972 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1972 1972-1977 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1978 Author(s): FAN XI-QING, WAN JUN, SHEN SAN-GUO <br/><p>The semiempirical modified embedded atom method has been applied to calculate the surface stress on the low index surfaces of fcc metals Ni,Pd and Pt,and the results are in agreement with that of the first principle calculation.The surface stress on fcc(110) surface along the [110] direction is about twice as large as in the [001] direction;and this indicates that the anisotropy of the surface stress is a characteristic of (110) surface of fcc metals.In addition,the magnitudes of the surface stresses on Pd and Pt(100) surfaces have been predicted.</p> <br/>Acta Physica Sinica. 1997 46(10): 1978-1983. Published 1997-05-05 Author(s): FAN XI-QING, WAN JUN, SHEN SAN-GUO <br/><p>The semiempirical modified embedded atom method has been applied to calculate the surface stress on the low index surfaces of fcc metals Ni,Pd and Pt,and the results are in agreement with that of the first principle calculation.The surface stress on fcc(110) surface along the [110] direction is about twice as large as in the [001] direction;and this indicates that the anisotropy of the surface stress is a characteristic of (110) surface of fcc metals.In addition,the magnitudes of the surface stresses on Pd and Pt(100) surfaces have been predicted.</p> <br/>Acta Physica Sinica. 1997 46(10): 1978-1983. Published 1997-05-05 STRESS ON THE Ni,Pd AND Pt SURFACES FAN XI-QING, WAN JUN, SHEN SAN-GUO 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1978-1983. article doi:10.7498/aps.46.1978 10.7498/aps.46.1978 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1978 1978-1983 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1984 Author(s): GU CHANG-ZHI, JIN ZENG-SUN, Lü XIAN-YI, ZOU GUANG-TIAN, ZHANG JI-FA, FANG RONG-CHUAN <br/><p>The scattering of phonons as main factors infuencing the thermal conductivity were analized theoretically. The thermal conductivity of diamond films was measured by means of the photothermal deflection method with an error of 5%. The effects of methane concentration and grain orientation on thermal conductivity of diamond films were studied. The results showed that (100) oriented diamond-films deposited by microwave plasma chemical vapour deposition method under low methane concentration have higher thermal conductivity.</p> <br/>Acta Physica Sinica. 1997 46(10): 1984-1989. Published 1997-05-05 Author(s): GU CHANG-ZHI, JIN ZENG-SUN, Lü XIAN-YI, ZOU GUANG-TIAN, ZHANG JI-FA, FANG RONG-CHUAN <br/><p>The scattering of phonons as main factors infuencing the thermal conductivity were analized theoretically. The thermal conductivity of diamond films was measured by means of the photothermal deflection method with an error of 5%. The effects of methane concentration and grain orientation on thermal conductivity of diamond films were studied. The results showed that (100) oriented diamond-films deposited by microwave plasma chemical vapour deposition method under low methane concentration have higher thermal conductivity.</p> <br/>Acta Physica Sinica. 1997 46(10): 1984-1989. Published 1997-05-05 STUDY OF THE DIAMOND FILMS WITH HIGH THERMAL CONDUCTIVITY GU CHANG-ZHI, JIN ZENG-SUN, Lü XIAN-YI, ZOU GUANG-TIAN, ZHANG JI-FA, FANG RONG-CHUAN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1984-1989. article doi:10.7498/aps.46.1984 10.7498/aps.46.1984 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1984 1984-1989 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1990 Author(s): ZHU XIAO-BIN, WANG WEI <br/><p>The kinetics and scaling behaviors of reaction-percolation ballistic surface growth with two kinds of particles A and C is investigated. When the probability of particle C is zero, i.e. q=0,the deposition is the traditional ballistic deposition of single particle. When the probability is not zero,i.e.q≠0, in 2+1 dimensions and 3+1 dimensions, the morphological structural transitions are observed. When q approaches the threshold, at which the growth will stop, there is a scaling behavior for the growth velocity, which can be interpreted by the percolation theory.</p> <br/>Acta Physica Sinica. 1997 46(10): 1990-1998. Published 1997-05-05 Author(s): ZHU XIAO-BIN, WANG WEI <br/><p>The kinetics and scaling behaviors of reaction-percolation ballistic surface growth with two kinds of particles A and C is investigated. When the probability of particle C is zero, i.e. q=0,the deposition is the traditional ballistic deposition of single particle. When the probability is not zero,i.e.q≠0, in 2+1 dimensions and 3+1 dimensions, the morphological structural transitions are observed. When q approaches the threshold, at which the growth will stop, there is a scaling behavior for the growth velocity, which can be interpreted by the percolation theory.</p> <br/>Acta Physica Sinica. 1997 46(10): 1990-1998. Published 1997-05-05 KINETICS AND SCALING BEHAVIOR OF REACTION PERCOLATION BALLISTIC SURFACE GROWTH ZHU XIAO-BIN, WANG WEI 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1990-1998. article doi:10.7498/aps.46.1990 10.7498/aps.46.1990 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1990 1990-1998 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1999 Author(s): JIA YU, FAN XI-QING, MA BING-XIAN <br/><p>By using the method of phenomenological scattering thoery,we have calculated the electronic structure of the CdTe(110) relaxed surface.The results are in good agreement with the experiments and other calculations.By analyzing the results we have discussed the origin of relaxation of CdTe(110) surface.</p> <br/>Acta Physica Sinica. 1997 46(10): 1999-2006. Published 1997-05-05 Author(s): JIA YU, FAN XI-QING, MA BING-XIAN <br/><p>By using the method of phenomenological scattering thoery,we have calculated the electronic structure of the CdTe(110) relaxed surface.The results are in good agreement with the experiments and other calculations.By analyzing the results we have discussed the origin of relaxation of CdTe(110) surface.</p> <br/>Acta Physica Sinica. 1997 46(10): 1999-2006. Published 1997-05-05 CALCULATION OF ELECTRONIC STATES OF THE CdTe(110) RELAXED SURFACE JIA YU, FAN XI-QING, MA BING-XIAN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 1999-2006. article doi:10.7498/aps.46.1999 10.7498/aps.46.1999 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.1999 1999-2006 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2007 Author(s): WANG JI-SUO, SUN CHANG-YONG <br/><p>Starting from equation of motion of an active LC circuit,the quantum fluctuations of the charge and current in the mesoscopic circuit (LC circuit) in the squeezed vacuum state are investigated.</p> <br/>Acta Physica Sinica. 1997 46(10): 2007-2009. Published 1997-05-05 Author(s): WANG JI-SUO, SUN CHANG-YONG <br/><p>Starting from equation of motion of an active LC circuit,the quantum fluctuations of the charge and current in the mesoscopic circuit (LC circuit) in the squeezed vacuum state are investigated.</p> <br/>Acta Physica Sinica. 1997 46(10): 2007-2009. Published 1997-05-05 QUANTUM FLUCTUATION OF MESOSCOPIC CIRCUIT IN SQUEEZED VACUUM STATE WANG JI-SUO, SUN CHANG-YONG 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 2007-2009. article doi:10.7498/aps.46.2007 10.7498/aps.46.2007 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2007 2007-2009 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2010 Author(s): HUANG JING-YUN, YE ZHI-ZHEN, QUE DUAN-LIN <br/><p>Effect of thermal strain on growth of SiGe strained layer on Si was analysed.Formulae for critical layer thickness were obtained by considering thermal strain in energy balance under the assumption of screw dislocation energy density equal to the sum of areal strain energy density and thermal strain energy density.The relationship between the thermal expansion coefficient associated with thermal strain and Ge content x was linear.The results are in good agreement with the experimental results reported.</p> <br/>Acta Physica Sinica. 1997 46(10): 2010-2014. Published 1997-05-05 Author(s): HUANG JING-YUN, YE ZHI-ZHEN, QUE DUAN-LIN <br/><p>Effect of thermal strain on growth of SiGe strained layer on Si was analysed.Formulae for critical layer thickness were obtained by considering thermal strain in energy balance under the assumption of screw dislocation energy density equal to the sum of areal strain energy density and thermal strain energy density.The relationship between the thermal expansion coefficient associated with thermal strain and Ge content x was linear.The results are in good agreement with the experimental results reported.</p> <br/>Acta Physica Sinica. 1997 46(10): 2010-2014. Published 1997-05-05 CALCULATION OF CRITICAL LAYER THICKNESS BY TAKING INTO ACCOUNT THE THERMAL STRAIN IN Si1-xGex /Si STRAIN LAYER HETEROSTRUCTURES HUANG JING-YUN, YE ZHI-ZHEN, QUE DUAN-LIN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 2010-2014. article doi:10.7498/aps.46.2010 10.7498/aps.46.2010 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2010 2010-2014 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2015 Author(s): CHEN GUO, GUO XIAO-XU, ZHU MEI-FANG, SUN JING-LAN, XU HUAI-ZHE, HAN YI-QIN <br/><p>The nc Si∶H thin films were prepared by hotfilament vapor deposition.The effect of gas pressure,-high H2 dilution and substrate-to-filament distance on deposition rate,the formation and structure of nc-Si∶H films was systematically studied.The structure of nc-Si∶H was determined using Raman scattering and X-ray diffraction.The temperature distribution was calculated;the travel of radicals evaporated from the filament and the gas-phase reaction were discussed in detail.The results were in agreement with the measurement.</p> <br/>Acta Physica Sinica. 1997 46(10): 2015-2022. Published 1997-05-05 Author(s): CHEN GUO, GUO XIAO-XU, ZHU MEI-FANG, SUN JING-LAN, XU HUAI-ZHE, HAN YI-QIN <br/><p>The nc Si∶H thin films were prepared by hotfilament vapor deposition.The effect of gas pressure,-high H2 dilution and substrate-to-filament distance on deposition rate,the formation and structure of nc-Si∶H films was systematically studied.The structure of nc-Si∶H was determined using Raman scattering and X-ray diffraction.The temperature distribution was calculated;the travel of radicals evaporated from the filament and the gas-phase reaction were discussed in detail.The results were in agreement with the measurement.</p> <br/>Acta Physica Sinica. 1997 46(10): 2015-2022. Published 1997-05-05 INVESTIGATION OF GROWTH MECHANISM OF NANOCRYSTALLINE SILICON THIN FILMS PREPARED BY HOT-FILAMENT CHEMICAL VAPOR DEPOSITION CHEN GUO, GUO XIAO-XU, ZHU MEI-FANG, SUN JING-LAN, XU HUAI-ZHE, HAN YI-QIN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 2015-2022. article doi:10.7498/aps.46.2015 10.7498/aps.46.2015 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2015 2015-2022 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2023 Author(s): LI YAN-RONG, LIU XIN-ZHAO, XU JIN, J.GEERK, R.SMITHY <br/><p>Thin films of GdBaCuO(GBCO) compound have been deposited in situ onto LaAlO3 single crystal substrates by inverted cylindrical sputtering.The variation of superconductive properties of the thin films with the substrate temperature and sputtering pressure has been systematic investigated.By the optimization of deposition parameter,high quality c-axis epitaxial GBCO thin films of Tc0&lt;92K were reproducibly grown at the substrate temperature of 720—820℃ with a low deposition total pressure (40Pa).The Tc0 of the best sample is as high as 93.2K.Only by changing the target composition into GdBa2Cu4Oy (Gd124),was it observed that the samples always contain some a-axis oriented films,impling that excess copper would favour a-axis growth in thin films,and the Tc of the samples is lower than that with Gd123 target.The superconductivity of the thin films under high substrate temperature was clearly improved by the procedure of special post oxygenization at 400℃ in ozone atmosphere.These results are very useful to further prepare large area thin films of GBCO.</p> <br/>Acta Physica Sinica. 1997 46(10): 2023-2028. Published 1997-05-05 Author(s): LI YAN-RONG, LIU XIN-ZHAO, XU JIN, J.GEERK, R.SMITHY <br/><p>Thin films of GdBaCuO(GBCO) compound have been deposited in situ onto LaAlO3 single crystal substrates by inverted cylindrical sputtering.The variation of superconductive properties of the thin films with the substrate temperature and sputtering pressure has been systematic investigated.By the optimization of deposition parameter,high quality c-axis epitaxial GBCO thin films of Tc0&lt;92K were reproducibly grown at the substrate temperature of 720—820℃ with a low deposition total pressure (40Pa).The Tc0 of the best sample is as high as 93.2K.Only by changing the target composition into GdBa2Cu4Oy (Gd124),was it observed that the samples always contain some a-axis oriented films,impling that excess copper would favour a-axis growth in thin films,and the Tc of the samples is lower than that with Gd123 target.The superconductivity of the thin films under high substrate temperature was clearly improved by the procedure of special post oxygenization at 400℃ in ozone atmosphere.These results are very useful to further prepare large area thin films of GBCO.</p> <br/>Acta Physica Sinica. 1997 46(10): 2023-2028. Published 1997-05-05 OPTIMIZATION OF Tc IN EPITAXIAL GdBaCuO SUPERCONDUCTING THIN FILM BY INVERTED CYLINDRICAL SPUTTERING LI YAN-RONG, LIU XIN-ZHAO, XU JIN, J.GEERK, R.SMITHY 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 2023-2028. article doi:10.7498/aps.46.2023 10.7498/aps.46.2023 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2023 2023-2028 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2029 Author(s): GAO ZHAN, WANG ZHEN-LIN, XU JIAN-HONG <br/><p>In this paper,a renormalization group scheme within the framework of the mean field theory is used to investigate the critical behavior at the surface of a semi infinite Ising system with mixed spins,i.e.S=1 at the surface and σ=1/2 in the bulk.The effects of a random field on the surface phase diagrams are obtained.</p> <br/>Acta Physica Sinica. 1997 46(10): 2029-2035. Published 1997-05-05 Author(s): GAO ZHAN, WANG ZHEN-LIN, XU JIAN-HONG <br/><p>In this paper,a renormalization group scheme within the framework of the mean field theory is used to investigate the critical behavior at the surface of a semi infinite Ising system with mixed spins,i.e.S=1 at the surface and σ=1/2 in the bulk.The effects of a random field on the surface phase diagrams are obtained.</p> <br/>Acta Physica Sinica. 1997 46(10): 2029-2035. Published 1997-05-05 CRITICAL BEHAVIOR AT THE SURFACE OF A SEMI INFINITE MIXED SPIN ISING SYSTEM WITH SURFACE RANDOM FIELD GAO ZHAN, WANG ZHEN-LIN, XU JIAN-HONG 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 2029-2035. article doi:10.7498/aps.46.2029 10.7498/aps.46.2029 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2029 2029-2035 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2036 Author(s): ZHU SHAN-HUA, HUANG GUO-XIANG, XU ZAI-XIN <br/><p>About the one-dimensional Heisenberg ferromagnetics chain with bond alternation,research results show,in first-order approximation,that (1) magnon gap solitons (with the vibrating frequency lying in the gap between magnon frequency band) and resonant kinks (with the vibrating frequency lying in the magnon frequency band) are found; (2) an instrinsic localized mode (with the vibrating frequency being above the magnon frequency band) is impossible.</p> <br/>Acta Physica Sinica. 1997 46(10): 2036-2046. Published 1997-05-05 Author(s): ZHU SHAN-HUA, HUANG GUO-XIANG, XU ZAI-XIN <br/><p>About the one-dimensional Heisenberg ferromagnetics chain with bond alternation,research results show,in first-order approximation,that (1) magnon gap solitons (with the vibrating frequency lying in the gap between magnon frequency band) and resonant kinks (with the vibrating frequency lying in the magnon frequency band) are found; (2) an instrinsic localized mode (with the vibrating frequency being above the magnon frequency band) is impossible.</p> <br/>Acta Physica Sinica. 1997 46(10): 2036-2046. Published 1997-05-05 NONLINEAR EXCITATIONS IN ONE DIMENSIONAL HEISENBERG FERROMAGNETIC CHAIN WITH BOND ALTERNATION ZHU SHAN-HUA, HUANG GUO-XIANG, XU ZAI-XIN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 2036-2046. article doi:10.7498/aps.46.2036 10.7498/aps.46.2036 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2036 2036-2046 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2047 Author(s): ZHAO HONG-WU, BIE QING-SHAN, DU JUN, LU MU, SUI YUN-XIA, ZHAI HONG-RU, XIA HUI <br/><p>The structural and magnetic properties of Co/Cu multilayers prepared by molecular beam epitaxy(MBE) and sputtering were investigated and compared with each other.It was found that the well defined layered structures existed in both samples,and the former was epitaxial single crystalline;while the latter was textured polycrystalline.Ferromagnetic resonance study showed the existence of a six-fold symmetry in the film plane,revealing the perfect in-plane structure of MBE samples.Giant magnetoresistance and its oscillation with the Cu thickness were found in sputtered samples.On the contrary,the magnetic resonance of MBE samples is smaller,about 7% for the second peak position.It is assumed that the superparamagnetic structure may be formed at interfaces in MBE samples which results in the different magnetic-field-dependent behaviors of magnetoresistance and- magnetization.</p> <br/>Acta Physica Sinica. 1997 46(10): 2047-2053. Published 1997-05-05 Author(s): ZHAO HONG-WU, BIE QING-SHAN, DU JUN, LU MU, SUI YUN-XIA, ZHAI HONG-RU, XIA HUI <br/><p>The structural and magnetic properties of Co/Cu multilayers prepared by molecular beam epitaxy(MBE) and sputtering were investigated and compared with each other.It was found that the well defined layered structures existed in both samples,and the former was epitaxial single crystalline;while the latter was textured polycrystalline.Ferromagnetic resonance study showed the existence of a six-fold symmetry in the film plane,revealing the perfect in-plane structure of MBE samples.Giant magnetoresistance and its oscillation with the Cu thickness were found in sputtered samples.On the contrary,the magnetic resonance of MBE samples is smaller,about 7% for the second peak position.It is assumed that the superparamagnetic structure may be formed at interfaces in MBE samples which results in the different magnetic-field-dependent behaviors of magnetoresistance and- magnetization.</p> <br/>Acta Physica Sinica. 1997 46(10): 2047-2053. Published 1997-05-05 COMPARATIVE STUDY OF STRUCTURAL AND MAGNETIC PROPERTIES OF Co/Cu MULTILAYERS MADE BY MBE AND SPUTTERING ZHAO HONG-WU, BIE QING-SHAN, DU JUN, LU MU, SUI YUN-XIA, ZHAI HONG-RU, XIA HUI 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 2047-2053. article doi:10.7498/aps.46.2047 10.7498/aps.46.2047 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2047 2047-2053 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2054 Author(s): WANG ZHI, HE KAI-YUAN, YIN JUN, ZHAO YU-HUA <br/><p>The correlation between initial permeability μi and temperature T(μi-T curve) for the Fe73.5Cu1Nb3Si13.5B9 alloy annealed at 300—610℃ was investigated.Three types of μi-T curve were observed. The corresponding annealing temperatures are (1)Ta≤460℃,(2) 480℃≤Ta≤580℃,(3) 590℃≤Ta≤610℃.The phase structures of the alloy corresponding to the three types of μi-T curve were analysed and the mechanisms for the changes of μi with T were also discussed.</p> <br/>Acta Physica Sinica. 1997 46(10): 2054-2058. Published 1997-05-05 Author(s): WANG ZHI, HE KAI-YUAN, YIN JUN, ZHAO YU-HUA <br/><p>The correlation between initial permeability μi and temperature T(μi-T curve) for the Fe73.5Cu1Nb3Si13.5B9 alloy annealed at 300—610℃ was investigated.Three types of μi-T curve were observed. The corresponding annealing temperatures are (1)Ta≤460℃,(2) 480℃≤Ta≤580℃,(3) 590℃≤Ta≤610℃.The phase structures of the alloy corresponding to the three types of μi-T curve were analysed and the mechanisms for the changes of μi with T were also discussed.</p> <br/>Acta Physica Sinica. 1997 46(10): 2054-2058. Published 1997-05-05 TEMPERATURE DEPENDENCE OF PERMEABILITY FOR Fe-Cu-Nb-Si-B ALLOY WANG ZHI, HE KAI-YUAN, YIN JUN, ZHAO YU-HUA 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 2054-2058. article doi:10.7498/aps.46.2054 10.7498/aps.46.2054 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2054 2054-2058 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2059 Author(s): LIU XIAO-BING, XIONG ZU-HONG, YUAN SHUAI, LIAO LIANG-SHENG, HE JUN, CAO XIAN-AN, MIAO XI-YUE, DING XUN-MIN, HOU XIAO-YUAN <br/><p>A new method for post-treatment of PS(porous silicon), sulfur passivation by microwave plasma assistance in vacuum,is reported in this paper.Fourier transform infrared spectrum indicated that the treated sample surface is mainly covered by SiSx and SiOy.Compared with the as etched PS,the photoluminescence (PL) intensity of the sample is 3.5 times stronger,and the 4nm blueshift of the PL peak was observed experimentally;furthermore,the intensity decay of the PL peak hasnot been observed after 60d in the atmosphere.Therefore,sulfur passivation is an effective post treatment for enhancing PL intensity and stabilization of PS.</p> <br/>Acta Physica Sinica. 1997 46(10): 2059-2065. Published 1997-05-05 Author(s): LIU XIAO-BING, XIONG ZU-HONG, YUAN SHUAI, LIAO LIANG-SHENG, HE JUN, CAO XIAN-AN, MIAO XI-YUE, DING XUN-MIN, HOU XIAO-YUAN <br/><p>A new method for post-treatment of PS(porous silicon), sulfur passivation by microwave plasma assistance in vacuum,is reported in this paper.Fourier transform infrared spectrum indicated that the treated sample surface is mainly covered by SiSx and SiOy.Compared with the as etched PS,the photoluminescence (PL) intensity of the sample is 3.5 times stronger,and the 4nm blueshift of the PL peak was observed experimentally;furthermore,the intensity decay of the PL peak hasnot been observed after 60d in the atmosphere.Therefore,sulfur passivation is an effective post treatment for enhancing PL intensity and stabilization of PS.</p> <br/>Acta Physica Sinica. 1997 46(10): 2059-2065. Published 1997-05-05 A NEW METHOD FOR POST TREATMENT OF POROUS SILICON:SULFUR PASSIVATION BY MICROWAVE PLASMA ASSISTANCE LIU XIAO-BING, XIONG ZU-HONG, YUAN SHUAI, LIAO LIANG-SHENG, HE JUN, CAO XIAN-AN, MIAO XI-YUE, DING XUN-MIN, HOU XIAO-YUAN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 2059-2065. article doi:10.7498/aps.46.2059 10.7498/aps.46.2059 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2059 2059-2065 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2066 Author(s): LI KAI-HANG, HUANG MEI-CHUN <br/><p>The linear muffin tin orbitals method was adopted to calculate the band structures of the strained- superlattice (ZnS)1/(ZnSe)1(001) grown on the Si substrate.In our calculation the external adjusted potential was used to overcome the problem of too small a band gap in it.On the basis of relatively accurately calculated band structure and wave function for this system,we calculated the imaginary part of dieletric function of the superlattice system.The results showed that the optical properties of (ZnS)1/(ZnSe)1(001) grown on the Si substrate consisted of the optical properties of bulk ZnS and of bulk ZnSe,and they have rather good optical response over a wide range of photon energy;futhermore,the superlattices are direct band gap materials.Thus the superlattices will become the promising materials for optoelectronic device applications.</p> <br/>Acta Physica Sinica. 1997 46(10): 2066-2070. Published 1997-05-05 Author(s): LI KAI-HANG, HUANG MEI-CHUN <br/><p>The linear muffin tin orbitals method was adopted to calculate the band structures of the strained- superlattice (ZnS)1/(ZnSe)1(001) grown on the Si substrate.In our calculation the external adjusted potential was used to overcome the problem of too small a band gap in it.On the basis of relatively accurately calculated band structure and wave function for this system,we calculated the imaginary part of dieletric function of the superlattice system.The results showed that the optical properties of (ZnS)1/(ZnSe)1(001) grown on the Si substrate consisted of the optical properties of bulk ZnS and of bulk ZnSe,and they have rather good optical response over a wide range of photon energy;futhermore,the superlattices are direct band gap materials.Thus the superlattices will become the promising materials for optoelectronic device applications.</p> <br/>Acta Physica Sinica. 1997 46(10): 2066-2070. Published 1997-05-05 THE OPTICAL PROPERTIES OF STRAINED SUPERLATTICE (ZnS)1/(ZnSe)1(001) LI KAI-HANG, HUANG MEI-CHUN 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 2066-2070. article doi:10.7498/aps.46.2066 10.7498/aps.46.2066 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2066 2066-2070 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2071 Author(s): YUAN RU-LIN, SHI ER-WEI, WANG BU-GUO, XIA CHANG-TAI, LI WEN-JUN, ZHONG WEI-ZHOU <br/><p>The zinc-based compound crystals, which are composed of zinc-anion coordinate tetrahedrons have two kinds of structure:one is wurtzite and the other is sphalerite.In this article the formation process and the ideal morphology of the sphalerite crystals are studied by calculating the stability energy of the crystal growth unit on the basis of the model of anion coordination polyhedron.The favorable growth unit for the growth of the sphalerite crystal is the tetrahedron.Thus the ideal morphology of sphalerite crystals is tetrahedron.The growth rate of the positive polar plane is different from that of the negative polar plane.It is proved by the calculation that zincoxide crystals are impossible to exist in sphalerite,so are zincsulphide crystals in wurtzite.</p> <br/>Acta Physica Sinica. 1997 46(10): 2071-2080. Published 1997-05-05 Author(s): YUAN RU-LIN, SHI ER-WEI, WANG BU-GUO, XIA CHANG-TAI, LI WEN-JUN, ZHONG WEI-ZHOU <br/><p>The zinc-based compound crystals, which are composed of zinc-anion coordinate tetrahedrons have two kinds of structure:one is wurtzite and the other is sphalerite.In this article the formation process and the ideal morphology of the sphalerite crystals are studied by calculating the stability energy of the crystal growth unit on the basis of the model of anion coordination polyhedron.The favorable growth unit for the growth of the sphalerite crystal is the tetrahedron.Thus the ideal morphology of sphalerite crystals is tetrahedron.The growth rate of the positive polar plane is different from that of the negative polar plane.It is proved by the calculation that zincoxide crystals are impossible to exist in sphalerite,so are zincsulphide crystals in wurtzite.</p> <br/>Acta Physica Sinica. 1997 46(10): 2071-2080. Published 1997-05-05 STABILITY ENERGY OF GROWTH-UNIT AND MORPHOLOGY OF SPHALERITE CRYSTALLITES YUAN RU-LIN, SHI ER-WEI, WANG BU-GUO, XIA CHANG-TAI, LI WEN-JUN, ZHONG WEI-ZHOU 1997-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1997 46(10): 2071-2080. article doi:10.7498/aps.46.2071 10.7498/aps.46.2071 Acta Physica Sinica 46 10 1997-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.46.2071 2071-2080

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