//www.getgobooth.com/ 必威体育下载 daily 15 2024-08-20 10:33:37 apsoffice@iphy.ac.cn apsoffice@iphy.ac.cn 2024-08-20 10:33:37 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.40.1025 Author(s): Gu Si-yuan;Li Bai-wen <br/><p>The oscillator strengths and lifetime for some states of Mg are calculated by using model-potential wavefunctions. After comparing the fesults with previous theretical and experimental data, it is concluded that for many states with weaker configuration mixing, these quantities can be well calculated by such singe configuration wavefunctions.</p> <br/>Acta Physica Sinica. 1991 40(7): 1025-1030. Published 1991-04-05 Author(s): Gu Si-yuan;Li Bai-wen <br/><p>The oscillator strengths and lifetime for some states of Mg are calculated by using model-potential wavefunctions. After comparing the fesults with previous theretical and experimental data, it is concluded that for many states with weaker configuration mixing, these quantities can be well calculated by such singe configuration wavefunctions.</p> <br/>Acta Physica Sinica. 1991 40(7): 1025-1030. Published 1991-04-05 CALCULATIONS OF CSCILLATOR STRENGTHS AND LIFETIMES OF Mg BY MODELPOTENTIAL WAVEFUNCTIONS Gu Si-yuan;Li Bai-wen 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1025-1030. article doi:10.7498/aps.40.1025 10.7498/aps.40.1025 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1025 1025-1030 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1031 Author(s): Huang Wen; XuXiang-yuan;Zhao Zheng-wen;Yu Jiang-chen;Chen Die-yan <br/><p></p> <br/>Acta Physica Sinica. 1991 40(7): 1031-1033. Published 1991-04-05 Author(s): Huang Wen; XuXiang-yuan;Zhao Zheng-wen;Yu Jiang-chen;Chen Die-yan <br/><p></p> <br/>Acta Physica Sinica. 1991 40(7): 1031-1033. Published 1991-04-05 FLUORESCENCE AND LIFETIME MEASUREMENT FOR Rul Huang Wen; XuXiang-yuan;Zhao Zheng-wen;Yu Jiang-chen;Chen Die-yan 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1031-1033. article doi:10.7498/aps.40.1031 10.7498/aps.40.1031 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1031 1031-1033 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1034 Author(s): Li Jie-ping <br/><p>In a laser field, for the electron scattered by Coulomb potential, when the wave function is expanded by Floquet partial wave, the Sehrodinger equation separates into the radial form by separation of variables. The system of equations for the radial wave function is infinitely coupling linear second order differential equations. When weak laser field is considered as a pertubation, the equations can be reduced into second order ordinary differential equations and they are integrable.The radial wave functions S-matrix and the cross section are obtained. Finally, the resonance lines appear for differential cases of polarizations no matter whether the dipole approximation is used. The resonance energies, the intensities of resonance lines are obtained. </p> <br/>Acta Physica Sinica. 1991 40(7): 1034-1041. Published 1991-04-05 Author(s): Li Jie-ping <br/><p>In a laser field, for the electron scattered by Coulomb potential, when the wave function is expanded by Floquet partial wave, the Sehrodinger equation separates into the radial form by separation of variables. The system of equations for the radial wave function is infinitely coupling linear second order differential equations. When weak laser field is considered as a pertubation, the equations can be reduced into second order ordinary differential equations and they are integrable.The radial wave functions S-matrix and the cross section are obtained. Finally, the resonance lines appear for differential cases of polarizations no matter whether the dipole approximation is used. The resonance energies, the intensities of resonance lines are obtained. </p> <br/>Acta Physica Sinica. 1991 40(7): 1034-1041. Published 1991-04-05 PERTURBATION SOLUTION FOR ELECTRON SCATTERED BY COULOMB POTENTIAL IN A WEAK LASER FIELD Li Jie-ping 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1034-1041. article doi:10.7498/aps.40.1034 10.7498/aps.40.1034 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1034 1034-1041 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1042 Author(s): Peng Jin-sheng; Li Gao-xiang; Zhou Peng <br/><p>In this paper, we investigate the time evolution of the atomic operators of a two-Ievel atom interacting with the field via a two –photon Process within and without the rotating-wave approximation (RWA) by means of non-relativestic QED. We also verified that the virtual photon field is the cause for quantum chaos embodied by the periodic decay and revival effect of the atom using the numerical and analytic methods, and discussed the reason of neglecting the influence of the virtual photon field on the revival time.</p> <br/>Acta Physica Sinica. 1991 40(7): 1042-1048. Published 1991-04-05 Author(s): Peng Jin-sheng; Li Gao-xiang; Zhou Peng <br/><p>In this paper, we investigate the time evolution of the atomic operators of a two-Ievel atom interacting with the field via a two –photon Process within and without the rotating-wave approximation (RWA) by means of non-relativestic QED. We also verified that the virtual photon field is the cause for quantum chaos embodied by the periodic decay and revival effect of the atom using the numerical and analytic methods, and discussed the reason of neglecting the influence of the virtual photon field on the revival time.</p> <br/>Acta Physica Sinica. 1991 40(7): 1042-1048. Published 1991-04-05 INFLUENCE OF THE VIRTUAL PHOTON FIELD ON THE PERIODIC DECAY AND REVIVAL EFFECT OF AN ATOM Peng Jin-sheng; Li Gao-xiang; Zhou Peng 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1042-1048. article doi:10.7498/aps.40.1042 10.7498/aps.40.1042 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1042 1042-1048 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1049 Author(s): Liu San-qiu;Liu Zheng-dong;Li Fo-quan; Cao Qi-chang <br/><p>In this paper, we have studied the nonlinear interaction of two cascade three-level atoms with singe mode field. The results show that the cooperative emission of two atoms can translate into synchronous when the strength of exciting field reaches a certain threshold. That is self-oganization may occur in many-atom system to form a “large atom system” at the threshold, producing synchronous ordered emission. Meanwhile, the second-order correlation degree of two-atom system is lager than that of single atom system due to the synchronous emission effect, i.e.bunching is strong but antibunching is weak. Moreover, the deeper squeezing of two-atom system is obtained since many-photon processes become stronger, and the strength of exciting field is required to be also stronger. </p> <br/>Acta Physica Sinica. 1991 40(7): 1049-1057. Published 1991-04-05 Author(s): Liu San-qiu;Liu Zheng-dong;Li Fo-quan; Cao Qi-chang <br/><p>In this paper, we have studied the nonlinear interaction of two cascade three-level atoms with singe mode field. The results show that the cooperative emission of two atoms can translate into synchronous when the strength of exciting field reaches a certain threshold. That is self-oganization may occur in many-atom system to form a “large atom system” at the threshold, producing synchronous ordered emission. Meanwhile, the second-order correlation degree of two-atom system is lager than that of single atom system due to the synchronous emission effect, i.e.bunching is strong but antibunching is weak. Moreover, the deeper squeezing of two-atom system is obtained since many-photon processes become stronger, and the strength of exciting field is required to be also stronger. </p> <br/>Acta Physica Sinica. 1991 40(7): 1049-1057. Published 1991-04-05 JAYNES一CUMMINGS MODE OF TWO CASCADE THREE LEVEL ATOMSA NDI TS NONLINEAR PROPERTY Liu San-qiu;Liu Zheng-dong;Li Fo-quan; Cao Qi-chang 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1049-1057. article doi:10.7498/aps.40.1049 10.7498/aps.40.1049 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1049 1049-1057 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1058 Author(s): Li Fu-li;Cai Jin-lin;Zhang Zhi-ming <br/><p></p> <br/>Acta Physica Sinica. 1991 40(7): 1058-1064. Published 1991-04-05 Author(s): Li Fu-li;Cai Jin-lin;Zhang Zhi-ming <br/><p></p> <br/>Acta Physica Sinica. 1991 40(7): 1058-1064. Published 1991-04-05 A NEW METHOD FOR CONSTRUCTING ORTHONORMAL EIGENVECTORS OF HIGH ORDER POWER OF PHOTON ANNIHILATION OPERATOR Li Fu-li;Cai Jin-lin;Zhang Zhi-ming 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1058-1064. article doi:10.7498/aps.40.1058 10.7498/aps.40.1058 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1058 1058-1064 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1065 Author(s): Zhang Guang-yin <br/><p>In solid laser resonator the dioptric strength of the thermal focusing lens, l/f, as a dynamic factor of the resonator, has great influence on the operation characters of the resonator. In this paper, using the transformation-circle diagrammatic approach, a dynamical analysis on the stability, character of output power and mode property of the solid laser resonator is represented in detail. Their relations on the dynamic factor are also derived.</p> <br/>Acta Physica Sinica. 1991 40(7): 1065-1073. Published 1991-04-05 Author(s): Zhang Guang-yin <br/><p>In solid laser resonator the dioptric strength of the thermal focusing lens, l/f, as a dynamic factor of the resonator, has great influence on the operation characters of the resonator. In this paper, using the transformation-circle diagrammatic approach, a dynamical analysis on the stability, character of output power and mode property of the solid laser resonator is represented in detail. Their relations on the dynamic factor are also derived.</p> <br/>Acta Physica Sinica. 1991 40(7): 1065-1073. Published 1991-04-05 A DYNAMICAL ANALYSIS ON SOLID LASER RESONATOR Zhang Guang-yin 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1065-1073. article doi:10.7498/aps.40.1065 10.7498/aps.40.1065 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1065 1065-1073 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1074 Author(s): Pan Shao-hua Feng Si-min Cui Da-fu Yan Guo-zhen <br/><p>By means of a new formalism of the Kronig-Ponney model developed recently, the third order nonlinear optical effect of intersubband transition In superlattices is studied. It is shown that there is a general relation between optical saturation intensity and tunnel bandwidth. The physical mechanism of this relation is analyzed.</p> <br/>Acta Physica Sinica. 1991 40(7): 1074-1079. Published 1991-04-05 Author(s): Pan Shao-hua Feng Si-min Cui Da-fu Yan Guo-zhen <br/><p>By means of a new formalism of the Kronig-Ponney model developed recently, the third order nonlinear optical effect of intersubband transition In superlattices is studied. It is shown that there is a general relation between optical saturation intensity and tunnel bandwidth. The physical mechanism of this relation is analyzed.</p> <br/>Acta Physica Sinica. 1991 40(7): 1074-1079. Published 1991-04-05 TUNNEL BROADENING EFFECT ON INTERSUBBAN OOPTICAL SATURATION INS UPERLATTICES Pan Shao-hua Feng Si-min Cui Da-fu Yan Guo-zhen 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1074-1079. article doi:10.7498/aps.40.1074 10.7498/aps.40.1074 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1074 1074-1079 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1080 Author(s): Xu Wen-lan <br/><p>The properties of vibrational states for one-dimensional quasi-lattice, specially, properties of critical states are studied. Some methods describing different vibrational states are given.</p> <br/>Acta Physica Sinica. 1991 40(7): 1080-1085. Published 1991-04-05 Author(s): Xu Wen-lan <br/><p>The properties of vibrational states for one-dimensional quasi-lattice, specially, properties of critical states are studied. Some methods describing different vibrational states are given.</p> <br/>Acta Physica Sinica. 1991 40(7): 1080-1085. Published 1991-04-05 A STUDY ON LATTICE VIBRATION IN ONE DIMENSIONAL QUASI一LATTICE Xu Wen-lan 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1080-1085. article doi:10.7498/aps.40.1080 10.7498/aps.40.1080 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1080 1080-1085 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1086 Author(s): Huang Xiou-qing; Liu You-yan;Zou Nan-zhi;Ma Peng-hui <br/><p>This paper is devoted to the study of phonon and melting property of two-demensional PeLrose lattice with five-fold rotational symmetric axis. We introduce a similarity transformation which transforms the dynamical matrix into a block-diagonal matrix, which helps to determine analytically the degeneracies of the modes of the phonon spectra and reduce the numerical calculation. It is found that two thirds of the modes are doubly degenerate and theremains are nondegenerate. By using the atomic mean-square displacement criterion, we study the melting property of the two-demensional Penrose lattice. We find that boundary atoms always have lower melting temperature than that of bulk, and when the interaction among atoms is larger, the system will have a higher melting temperature.</p> <br/>Acta Physica Sinica. 1991 40(7): 1086-1094. Published 1991-04-05 Author(s): Huang Xiou-qing; Liu You-yan;Zou Nan-zhi;Ma Peng-hui <br/><p>This paper is devoted to the study of phonon and melting property of two-demensional PeLrose lattice with five-fold rotational symmetric axis. We introduce a similarity transformation which transforms the dynamical matrix into a block-diagonal matrix, which helps to determine analytically the degeneracies of the modes of the phonon spectra and reduce the numerical calculation. It is found that two thirds of the modes are doubly degenerate and theremains are nondegenerate. By using the atomic mean-square displacement criterion, we study the melting property of the two-demensional Penrose lattice. We find that boundary atoms always have lower melting temperature than that of bulk, and when the interaction among atoms is larger, the system will have a higher melting temperature.</p> <br/>Acta Physica Sinica. 1991 40(7): 1086-1094. Published 1991-04-05 PHONON AND MELTING PROPERTY OF THE TWO DIMENSIONAL PENROSE QUASICRYSTALS Huang Xiou-qing; Liu You-yan;Zou Nan-zhi;Ma Peng-hui 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1086-1094. article doi:10.7498/aps.40.1086 10.7498/aps.40.1086 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1086 1086-1094 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1095 Author(s): Liang Pei-hui Zhang Wei-qing A.Muller <br/><p>In temperature range of 20K to 300K, we measured photoluminescence spectra of heterogeneous J-aggregate Langmiur-Blodgett (LB) films made of three kinds of cyanine dye. With temperature reduced, while the intensity of J-peak, the zero phonon line increased, anomalous enhancement of the phonon sideband was observed. Analysis shows that J-aggregate LB films are of characteristics like that of low dimensional crystal, they have strong phonon coupling and nonradiative transition plays important role.</p> <br/>Acta Physica Sinica. 1991 40(7): 1095-1100. Published 1991-04-05 Author(s): Liang Pei-hui Zhang Wei-qing A.Muller <br/><p>In temperature range of 20K to 300K, we measured photoluminescence spectra of heterogeneous J-aggregate Langmiur-Blodgett (LB) films made of three kinds of cyanine dye. With temperature reduced, while the intensity of J-peak, the zero phonon line increased, anomalous enhancement of the phonon sideband was observed. Analysis shows that J-aggregate LB films are of characteristics like that of low dimensional crystal, they have strong phonon coupling and nonradiative transition plays important role.</p> <br/>Acta Physica Sinica. 1991 40(7): 1095-1100. Published 1991-04-05 MULTIPHONON TRANSITION AND TEMPERATURE DEPENDENCE OF PHOTOLUMINESCENCE SPECTRA OF DYE J一AGGREGATE LANGMIUR-BLODGETT FILMS Liang Pei-hui Zhang Wei-qing A.Muller 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1095-1100. article doi:10.7498/aps.40.1095 10.7498/aps.40.1095 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1095 1095-1100 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1101 Author(s): Cui Wan-qiu; Shen Zhi-qi; Zhou De-bao <br/><p></p> <br/>Acta Physica Sinica. 1991 40(7): 1101-1109. Published 1991-04-05 Author(s): Cui Wan-qiu; Shen Zhi-qi; Zhou De-bao <br/><p></p> <br/>Acta Physica Sinica. 1991 40(7): 1101-1109. Published 1991-04-05 STUDY ON THE STRUCTURE THE ELECTRICAL PROPERTIES AND THE CONDUCTION MECHANISM OF THE POLYCRYSTAL MULTIPHASE MATERIAL Li_2Mo_2-x_W_xO_6 Cui Wan-qiu; Shen Zhi-qi; Zhou De-bao 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1101-1109. article doi:10.7498/aps.40.1101 10.7498/aps.40.1101 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1101 1101-1109 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1110 Author(s): Cheng Huan-sheng; Yao Xiao-wei; Yang fu-jia <br/><p>The experimental method for studying interface atomic structure between amorphous layer and crystal by MeV ion scattering and channeling is described. This method is applied to study the Al_2_O_3_/AI(100) interface . Thin AI oxide film are formed on clean AI(100) surface in pure oxygen ambience at 400℃. The experimental results show that the composition of the oxide film is precisely Al_2_O_3 and the interface between AI oxide film Al(100) bulk is very sharp, the reconstructive layer under the Al_2_O_3 film is no more than one monolayer. Monte carlo simulations indicate the distance between displaced Al atoms on the reconstructive layer and Al(100) axis is 0.18A. At room temperature, the oxygen adsorption layer of Al(100) is primarily stoichiometric AlO at low surface coverages.</p> <br/>Acta Physica Sinica. 1991 40(7): 1110-1115. Published 1991-04-05 Author(s): Cheng Huan-sheng; Yao Xiao-wei; Yang fu-jia <br/><p>The experimental method for studying interface atomic structure between amorphous layer and crystal by MeV ion scattering and channeling is described. This method is applied to study the Al_2_O_3_/AI(100) interface . Thin AI oxide film are formed on clean AI(100) surface in pure oxygen ambience at 400℃. The experimental results show that the composition of the oxide film is precisely Al_2_O_3 and the interface between AI oxide film Al(100) bulk is very sharp, the reconstructive layer under the Al_2_O_3 film is no more than one monolayer. Monte carlo simulations indicate the distance between displaced Al atoms on the reconstructive layer and Al(100) axis is 0.18A. At room temperature, the oxygen adsorption layer of Al(100) is primarily stoichiometric AlO at low surface coverages.</p> <br/>Acta Physica Sinica. 1991 40(7): 1110-1115. Published 1991-04-05 STUDIES OF INTERFACE ATOMIC STRUCTURE OF Al_2_O_3_/AI(100) BY MeV ION SCATTERING AND CHANNELING STUDIES OF INTERFACE ATOMIC STRUCTURE OF AL_2_O_3_/AI (100) BY MeV ION SCATTERING AND CHANNELING Cheng Huan-sheng; Yao Xiao-wei; Yang fu-jia 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1110-1115. article doi:10.7498/aps.40.1110 10.7498/aps.40.1110 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1110 1110-1115 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1116 Author(s): Cao Pei-lin Zhou Xu-yan Zhou Ru-hong <br/><p>Using ASED-MO method and cluster models, the chemisorptions energy of Li on Si(100) 2XI surface and the interaction between two adsorbed Li atoms are calculated. A new model which Can be used to explain the transition from Si(100)-Li(2Xl) to Li(1Xl) in the 1 monolayer range is proposed.</p> <br/>Acta Physica Sinica. 1991 40(7): 1116-1120. Published 1991-04-05 Author(s): Cao Pei-lin Zhou Xu-yan Zhou Ru-hong <br/><p>Using ASED-MO method and cluster models, the chemisorptions energy of Li on Si(100) 2XI surface and the interaction between two adsorbed Li atoms are calculated. A new model which Can be used to explain the transition from Si(100)-Li(2Xl) to Li(1Xl) in the 1 monolayer range is proposed.</p> <br/>Acta Physica Sinica. 1991 40(7): 1116-1120. Published 1991-04-05 INTERACTION BETWEEN Li ATOMS ON Si(100)2×1 AND PHASE CHANGE OF SURFACE STRUCTURE Cao Pei-lin Zhou Xu-yan Zhou Ru-hong 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1116-1120. article doi:10.7498/aps.40.1116 10.7498/aps.40.1116 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1116 1116-1120 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1121 Author(s): Zhou Guo-liang Sheng Chi Fan Yong-liang Jiang Wei-dong Yu Ming-reng <br/><p>Ge_xSi_1-x_/Si strained-layer superlattices were grown on Si(100) substrates under different temperatures by molecular beam epitaxy. Methods such as reflection high energy electron diffraction, X-ray double crystal diffraction, Rutherford back scattering, transmission electron microscopy and Raman scattering have been applied to study the growth and characteristics of the Ge_xSi_1-x_/Si superlattices. The result show that the optimum growth temperature are different for superlattices with different composition, the small the x the higher the growth temperature, and vice versa. For x=0.1-0.6, the Ge_xSi_1-x_/Si superlattices with flat interfaces, good crystal perfection and uniform periodicity can be obtained with growth temperature in the range of 400一600℃.</p> <br/>Acta Physica Sinica. 1991 40(7): 1121-1128. Published 1991-04-05 Author(s): Zhou Guo-liang Sheng Chi Fan Yong-liang Jiang Wei-dong Yu Ming-reng <br/><p>Ge_xSi_1-x_/Si strained-layer superlattices were grown on Si(100) substrates under different temperatures by molecular beam epitaxy. Methods such as reflection high energy electron diffraction, X-ray double crystal diffraction, Rutherford back scattering, transmission electron microscopy and Raman scattering have been applied to study the growth and characteristics of the Ge_xSi_1-x_/Si superlattices. The result show that the optimum growth temperature are different for superlattices with different composition, the small the x the higher the growth temperature, and vice versa. For x=0.1-0.6, the Ge_xSi_1-x_/Si superlattices with flat interfaces, good crystal perfection and uniform periodicity can be obtained with growth temperature in the range of 400一600℃.</p> <br/>Acta Physica Sinica. 1991 40(7): 1121-1128. Published 1991-04-05 MOLECULAR BEAM EPITAXY GROWTH AND CHARACTERIZATION OF Ge_xSi_1-x_/Si STRAINED一AYER SUPERLATTICES Zhou Guo-liang Sheng Chi Fan Yong-liang Jiang Wei-dong Yu Ming-reng 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1121-1128. article doi:10.7498/aps.40.1121 10.7498/aps.40.1121 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1121 1121-1128 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1129 Author(s): Zou Nan-zhi Liang Kai-feng Lin Zhi-cheng <br/><p>We calculate the lattice heat capacity of layered material based on simple with cubic structure and Born potential. It is shown that interface states affect the lattice capacity obviously when the thickness of layer is relatively small (less than several tens of single la-years). With the increasing of thickness of the layer, the lattice capacity decreses and is nearly independent of interface states and thickness of the layer. We also give a comparison of the lattice capacity of aperiodic superlattice with that of periodic superlattice.</p> <br/>Acta Physica Sinica. 1991 40(7): 1129-1133. Published 1991-04-05 Author(s): Zou Nan-zhi Liang Kai-feng Lin Zhi-cheng <br/><p>We calculate the lattice heat capacity of layered material based on simple with cubic structure and Born potential. It is shown that interface states affect the lattice capacity obviously when the thickness of layer is relatively small (less than several tens of single la-years). With the increasing of thickness of the layer, the lattice capacity decreses and is nearly independent of interface states and thickness of the layer. We also give a comparison of the lattice capacity of aperiodic superlattice with that of periodic superlattice.</p> <br/>Acta Physica Sinica. 1991 40(7): 1129-1133. Published 1991-04-05 CALCULATION OF LATTICE HEAT CAPACITY OF LAYERED MATERIAL BASED ON A SIMPLE MODEL Zou Nan-zhi Liang Kai-feng Lin Zhi-cheng 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1129-1133. article doi:10.7498/aps.40.1129 10.7498/aps.40.1129 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1129 1129-1133 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1134 Author(s): Bai Hai-yang;Vhen Hong; Zhang Yun;Wang Wen-kui <br/><p>Solid state reaction interdiffusion of Fe-Ti multilayer modulated films was investigated by means of dynamic in situ X-ray diffraction. With this method, the measurement of the X-ray modulation peak intensity was relatively accurate and the shift in X-ray modulation peak position was also observed. The interdiffusion coefficients of Fe-Ti modulated films were calculated at different temperatures. Plots of the interdiffusion coefficients versus time at different temperatures were given, According to the variation rate of D vs.t, the activation energy Q relative to viscosity relaxation was calculate to be 8.3±0.2 kal/mol. </p> <br/>Acta Physica Sinica. 1991 40(7): 1134-1140. Published 1991-04-05 Author(s): Bai Hai-yang;Vhen Hong; Zhang Yun;Wang Wen-kui <br/><p>Solid state reaction interdiffusion of Fe-Ti multilayer modulated films was investigated by means of dynamic in situ X-ray diffraction. With this method, the measurement of the X-ray modulation peak intensity was relatively accurate and the shift in X-ray modulation peak position was also observed. The interdiffusion coefficients of Fe-Ti modulated films were calculated at different temperatures. Plots of the interdiffusion coefficients versus time at different temperatures were given, According to the variation rate of D vs.t, the activation energy Q relative to viscosity relaxation was calculate to be 8.3±0.2 kal/mol. </p> <br/>Acta Physica Sinica. 1991 40(7): 1134-1140. Published 1991-04-05 STUDY ON SOLID STATE REACTION INTERDIFFUSION OF Fe一Ti MULTILAYER MODULATED FILMS WITH DYNAMIC IN SITU X一RAY DIFFRACTION Bai Hai-yang;Vhen Hong; Zhang Yun;Wang Wen-kui 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1134-1140. article doi:10.7498/aps.40.1134 10.7498/aps.40.1134 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1134 1134-1140 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1141 Author(s): Huang Hong-bin <br/><p>Under Bose and non-Bose approximations, the squeezing, antibunching and sub-Poissonian statistics of one-exciton and two-exciton in the Dicke and Fock superposition states are discussed. The recombination radiation of excitons in these superposition states can also have these non-classical effects. The results obtained in various situations are compared and explained.</p> <br/>Acta Physica Sinica. 1991 40(7): 1141-1148. Published 1991-04-05 Author(s): Huang Hong-bin <br/><p>Under Bose and non-Bose approximations, the squeezing, antibunching and sub-Poissonian statistics of one-exciton and two-exciton in the Dicke and Fock superposition states are discussed. The recombination radiation of excitons in these superposition states can also have these non-classical effects. The results obtained in various situations are compared and explained.</p> <br/>Acta Physica Sinica. 1991 40(7): 1141-1148. Published 1991-04-05 SUPERPOSITION STATES OF EXCITONS IN SEMICONDUCTOR AND RECOMBINATION RADIATION Huang Hong-bin 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1141-1148. article doi:10.7498/aps.40.1141 10.7498/aps.40.1141 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1141 1141-1148 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1149 Author(s): Wang Xiao;Cai Jiang-hua <br/><p>The collective excitations of three-dimensional tight-binding electron gas system have been studied in the case of three different kinds of structures (s.c.,f.c.c.,b.c.c.). By random phase approximation, we obtain the matrix formulation of the theory.</p> <br/>Acta Physica Sinica. 1991 40(7): 1149-1156. Published 1991-04-05 Author(s): Wang Xiao;Cai Jiang-hua <br/><p>The collective excitations of three-dimensional tight-binding electron gas system have been studied in the case of three different kinds of structures (s.c.,f.c.c.,b.c.c.). By random phase approximation, we obtain the matrix formulation of the theory.</p> <br/>Acta Physica Sinica. 1991 40(7): 1149-1156. Published 1991-04-05 PLASMON THEORY OF THREE-DIMENSIONAL TIGHT-BINDING ELECTRON GAS Wang Xiao;Cai Jiang-hua 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1149-1156. article doi:10.7498/aps.40.1149 10.7498/aps.40.1149 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1149 1149-1156 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1157 Author(s): Jiang Qi; Shen Shun-qing; Tao Rui-bao <br/><p>Using the multi-channel generalization of Landauer formula, we investigate the adiabatic transport and the Ohmic transport of two unequal narrow constrictions in series with a closed cavity in between. It is shown that the adiabatic transmission leads to the nonadditivity of constriction’s resistances, and the completely incoherent transport obeys the Obmic addition rule.</p> <br/>Acta Physica Sinica. 1991 40(7): 1157-1161. Published 1991-04-05 Author(s): Jiang Qi; Shen Shun-qing; Tao Rui-bao <br/><p>Using the multi-channel generalization of Landauer formula, we investigate the adiabatic transport and the Ohmic transport of two unequal narrow constrictions in series with a closed cavity in between. It is shown that the adiabatic transmission leads to the nonadditivity of constriction’s resistances, and the completely incoherent transport obeys the Obmic addition rule.</p> <br/>Acta Physica Sinica. 1991 40(7): 1157-1161. Published 1991-04-05 A DIABATIC TRANSPORT AND OHMIC TRANSPORT OF NARROW CONSTRICTI0NS IN SERIES Jiang Qi; Shen Shun-qing; Tao Rui-bao 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1157-1161. article doi:10.7498/aps.40.1157 10.7498/aps.40.1157 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1157 1157-1161 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1162 Author(s): Shi Yun-long Chen hong Wu Xiang <br/><p>The ground states of phonons in dissipative quantum tunneling system and their influences on the localization delocalization transition are investigated by a variational approach. We find that: 1.There are two kind of influences, displacement and deformation, on phonon describe both these influences. 2. The localization-delocalization transition depends on the choice of phonon ground state. The transition will occur at strong coupling as the energy of the ground state decreases. </p> <br/>Acta Physica Sinica. 1991 40(7): 1162-1173. Published 1991-04-05 Author(s): Shi Yun-long Chen hong Wu Xiang <br/><p>The ground states of phonons in dissipative quantum tunneling system and their influences on the localization delocalization transition are investigated by a variational approach. We find that: 1.There are two kind of influences, displacement and deformation, on phonon describe both these influences. 2. The localization-delocalization transition depends on the choice of phonon ground state. The transition will occur at strong coupling as the energy of the ground state decreases. </p> <br/>Acta Physica Sinica. 1991 40(7): 1162-1173. Published 1991-04-05 VARIArl0NAL STUDY OF ADISSIPATIVE QUANTUM TUNNELING SYSTEM Shi Yun-long Chen hong Wu Xiang 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1162-1173. article doi:10.7498/aps.40.1162 10.7498/aps.40.1162 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1162 1162-1173 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1174 Author(s): Zhang Yi-tong Jin Xin Zhang Chang-gui Jin Ji-rong Yao Xi=xian Ji Zheng-ming Sun Zhi-jian Yang Sen-zu <br/><p>Two high T_c_ superconductor YBa_2Cu_3O_7_ thin films, the zero resistance temperature of which were 82K and 7lK respectively, were selected for measurement about resistance broadening. The difference in thermal activation energy of the two samples was analyzed with Arrhenius law auggested by Palstra. We found that the activation energy decreased depending upon increasing magnetic field. The irreversibility line was B * -(l -T*/T_c_)**3/2 deduced from our data.</p> <br/>Acta Physica Sinica. 1991 40(7): 1174-1178. Published 1991-04-05 Author(s): Zhang Yi-tong Jin Xin Zhang Chang-gui Jin Ji-rong Yao Xi=xian Ji Zheng-ming Sun Zhi-jian Yang Sen-zu <br/><p>Two high T_c_ superconductor YBa_2Cu_3O_7_ thin films, the zero resistance temperature of which were 82K and 7lK respectively, were selected for measurement about resistance broadening. The difference in thermal activation energy of the two samples was analyzed with Arrhenius law auggested by Palstra. We found that the activation energy decreased depending upon increasing magnetic field. The irreversibility line was B * -(l -T*/T_c_)**3/2 deduced from our data.</p> <br/>Acta Physica Sinica. 1991 40(7): 1174-1178. Published 1991-04-05 A STUDY ON MAGNETIC THERMALLY FLUX CREEP OF YBa_2Cu_3O_7_,THIN FILM Zhang Yi-tong Jin Xin Zhang Chang-gui Jin Ji-rong Yao Xi=xian Ji Zheng-ming Sun Zhi-jian Yang Sen-zu 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1174-1178. article doi:10.7498/aps.40.1174 10.7498/aps.40.1174 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1174 1174-1178 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1179 Author(s): Li Hua Jiang Shou-ting Mei Liang-mo Gao Ru-wei <br/><p>Based on the fact of the existence of a small amount itinerant electrons, a new theoretical model giving rise to magneto-crystalline anisotropy in compound Nd_2Fe_14_B is presented in this paper. It is proposed that a combined effect on Nd一ion coming from both the crystal field of ligands and the electric field of itinerant electrons results in the anisotropy in the compound. An approach of calculating the interaction between itinerant electrons and central Nd-ion given. The magneto-crystalline anisotropy of Nd-ion and its temperature dependences are calculated based on the model. The results are in good agreement with the experiments, and also give explanation to the spin reorientation Phenomenon in the compound.</p> <br/>Acta Physica Sinica. 1991 40(7): 1179-1185. Published 1991-04-05 Author(s): Li Hua Jiang Shou-ting Mei Liang-mo Gao Ru-wei <br/><p>Based on the fact of the existence of a small amount itinerant electrons, a new theoretical model giving rise to magneto-crystalline anisotropy in compound Nd_2Fe_14_B is presented in this paper. It is proposed that a combined effect on Nd一ion coming from both the crystal field of ligands and the electric field of itinerant electrons results in the anisotropy in the compound. An approach of calculating the interaction between itinerant electrons and central Nd-ion given. The magneto-crystalline anisotropy of Nd-ion and its temperature dependences are calculated based on the model. The results are in good agreement with the experiments, and also give explanation to the spin reorientation Phenomenon in the compound.</p> <br/>Acta Physica Sinica. 1991 40(7): 1179-1185. Published 1991-04-05 RESEARCH ON THE ORIGIN OF MAGNET O-CRYSTALLINE ANISOTROPY IN COMPOUND Nd_2Fe_14_B Li Hua Jiang Shou-ting Mei Liang-mo Gao Ru-wei 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1179-1185. article doi:10.7498/aps.40.1179 10.7498/aps.40.1179 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1179 1179-1185 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1186 Author(s): Yang Ying-chang; Kong Lin-shu; Zhang yiao-dong; Jiao Jia-bin; Cheng Ben-pei;Kong Jie <br/><p>We have studied the structure and intrinsic magnetic properties of R_2Fe_17_C compound (R=Y,Sm,Gd,Tb,DyandEr), and compounds them with the corresponding R_2Fe_17_ compounds. The Curie temperatures of R_2Fe_17_C are about 200K greater than those of R_2Fe_17_. We discussed the variation of the structure and magnetism of the compounds due to introducing C atoms. Furthermore, Sm_2_(Fe_1-x_Co_x_)_17_C compound have also been studied.</p> <br/>Acta Physica Sinica. 1991 40(7): 1186-1192. Published 1991-04-05 Author(s): Yang Ying-chang; Kong Lin-shu; Zhang yiao-dong; Jiao Jia-bin; Cheng Ben-pei;Kong Jie <br/><p>We have studied the structure and intrinsic magnetic properties of R_2Fe_17_C compound (R=Y,Sm,Gd,Tb,DyandEr), and compounds them with the corresponding R_2Fe_17_ compounds. The Curie temperatures of R_2Fe_17_C are about 200K greater than those of R_2Fe_17_. We discussed the variation of the structure and magnetism of the compounds due to introducing C atoms. Furthermore, Sm_2_(Fe_1-x_Co_x_)_17_C compound have also been studied.</p> <br/>Acta Physica Sinica. 1991 40(7): 1186-1192. Published 1991-04-05 STRUCTURE AND INTRINSIC MAGNETIC PROPERTIES OF R_2Fe_17_C COMPOUNDS Yang Ying-chang; Kong Lin-shu; Zhang yiao-dong; Jiao Jia-bin; Cheng Ben-pei;Kong Jie 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1186-1192. article doi:10.7498/aps.40.1186 10.7498/aps.40.1186 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1186 1186-1192 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1193 Author(s): Zhang hui-qi;Jiang Zheng-sheng;Xu You; Duan Ming-qian;Yang Gui-lin <br/><p>The Faraday rotation caused by electronic transitions between the 4f and 5d states of Ce ions in paramagnetic CeF_3_ crystals is calculated. The crystal field is an important perturbation on the energy levels. An external magnetic field, together with an additive magnetic field introduced phenomenologically in our paper, would spilt every 4f state into two sublevels. The dipole transitions between these sublevels, and 5d states induce the Faradap effect. The Verdet constant at 0.6328 um in the temperature range of 60-300K is obtained. It is shown that our calculation is in good agreement with experiment.</p> <br/>Acta Physica Sinica. 1991 40(7): 1193-1200. Published 1991-04-05 Author(s): Zhang hui-qi;Jiang Zheng-sheng;Xu You; Duan Ming-qian;Yang Gui-lin <br/><p>The Faraday rotation caused by electronic transitions between the 4f and 5d states of Ce ions in paramagnetic CeF_3_ crystals is calculated. The crystal field is an important perturbation on the energy levels. An external magnetic field, together with an additive magnetic field introduced phenomenologically in our paper, would spilt every 4f state into two sublevels. The dipole transitions between these sublevels, and 5d states induce the Faradap effect. The Verdet constant at 0.6328 um in the temperature range of 60-300K is obtained. It is shown that our calculation is in good agreement with experiment.</p> <br/>Acta Physica Sinica. 1991 40(7): 1193-1200. Published 1991-04-05 QUANTUM THEORY FOR FARADAY EFFECT AND IT’S TEMPERATURE DEPENDCE IN PARAMAGNETIC CeF_3_ CRYTALS Zhang hui-qi;Jiang Zheng-sheng;Xu You; Duan Ming-qian;Yang Gui-lin 1991-04-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1991 40(7): 1193-1200. article doi:10.7498/aps.40.1193 10.7498/aps.40.1193 Acta Physica Sinica 40 7 1991-04-05 //www.getgobooth.com/en/article/doi/10.7498/aps.40.1193 1193-1200

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