//www.getgobooth.com/ 必威体育下载 daily 15 2024-08-20 10:33:38 apsoffice@iphy.ac.cn apsoffice@iphy.ac.cn 2024-08-20 10:33:38 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.39.169 Author(s): LI JIAN-ZENG, LIANG CAN-BIN <br/><p>It is shown in this paper that the electromagnetic field yielding a semi-plane-symnmetric metric can be either plane-symmetric or semi-plane-symmetric. If it is plane-symmetric, then it must be a non-null electromagnetic field, while if it is semi-plane-symmetric, then it can be either null or non-null. The general solution of semi-plane-symmetric spacetimes yielded by semi-plane-symmetric sourceless null electromagnetic field is also given in this paper.</p> <br/>Acta Physica Sinica. 1990 39(2): 169-176. Published 1990-01-05 Author(s): LI JIAN-ZENG, LIANG CAN-BIN <br/><p>It is shown in this paper that the electromagnetic field yielding a semi-plane-symnmetric metric can be either plane-symmetric or semi-plane-symmetric. If it is plane-symmetric, then it must be a non-null electromagnetic field, while if it is semi-plane-symmetric, then it can be either null or non-null. The general solution of semi-plane-symmetric spacetimes yielded by semi-plane-symmetric sourceless null electromagnetic field is also given in this paper.</p> <br/>Acta Physica Sinica. 1990 39(2): 169-176. Published 1990-01-05 A FAMILY OF SEMI-PLANE-SYMMETRIC ELECTROVACUUM SPACETIMES LI JIAN-ZENG, LIANG CAN-BIN 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 169-176. article doi:10.7498/aps.39.169 10.7498/aps.39.169 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.169 169-176 //www.getgobooth.com/en/article/doi/10.7498/aps.39.177 Author(s): WANG WEI-NING, FANG YAN, FU SHI-YOU, ZHANG PENG-XIANG <br/><p>The influence of adding KCI to silver colloid on light absorption of the colloid was studied and compared with that of adding pyridine to the colloid. It was found that the light absorption was increased due to the formation of an atomic cluster layer on the Ag particle surfaces caused by adding KCI, and that the original surfaces plasmon resonance absorption was reduced. At the same time, the linear-chain aggregation caused by adding KCI lead to an apparent red shift of the plasmon resonance absorption, which sometimes was difficult to observe. The influence of these changes on SERS was also discussed.</p> <br/>Acta Physica Sinica. 1990 39(2): 177-182. Published 1990-01-05 Author(s): WANG WEI-NING, FANG YAN, FU SHI-YOU, ZHANG PENG-XIANG <br/><p>The influence of adding KCI to silver colloid on light absorption of the colloid was studied and compared with that of adding pyridine to the colloid. It was found that the light absorption was increased due to the formation of an atomic cluster layer on the Ag particle surfaces caused by adding KCI, and that the original surfaces plasmon resonance absorption was reduced. At the same time, the linear-chain aggregation caused by adding KCI lead to an apparent red shift of the plasmon resonance absorption, which sometimes was difficult to observe. The influence of these changes on SERS was also discussed.</p> <br/>Acta Physica Sinica. 1990 39(2): 177-182. Published 1990-01-05 INFLUENCE OF ADDING KCl ON LIGHT ABSORPTION SPECTRA OF SILVER COLLOID WANG WEI-NING, FANG YAN, FU SHI-YOU, ZHANG PENG-XIANG 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 177-182. article doi:10.7498/aps.39.177 10.7498/aps.39.177 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.177 177-182 //www.getgobooth.com/en/article/doi/10.7498/aps.39.183 Author(s): ZHANG LI-GEN, CHEN NAN-PENG, BA EN-XU <br/><p>The effects of transverse distribution of light field on CO2 laser instabilities are studied by means of light feedback. The phenomena of pulsing frequency shift and chaos in CO2 laser caused by light feedback are observed experimentally. The mechanism of laser instabilities resulting from the transverse distribution is discussed.</p> <br/>Acta Physica Sinica. 1990 39(2): 183-189. Published 1990-01-05 Author(s): ZHANG LI-GEN, CHEN NAN-PENG, BA EN-XU <br/><p>The effects of transverse distribution of light field on CO2 laser instabilities are studied by means of light feedback. The phenomena of pulsing frequency shift and chaos in CO2 laser caused by light feedback are observed experimentally. The mechanism of laser instabilities resulting from the transverse distribution is discussed.</p> <br/>Acta Physica Sinica. 1990 39(2): 183-189. Published 1990-01-05 EFFECTS OF LIGHT FEEDBACK ON CO2 LASER INSTABILITIES ZHANG LI-GEN, CHEN NAN-PENG, BA EN-XU 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 183-189. article doi:10.7498/aps.39.183 10.7498/aps.39.183 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.183 183-189 //www.getgobooth.com/en/article/doi/10.7498/aps.39.190 Author(s): LU SHI-PING, YUAN YI-QIAN, YANG LI-SHU, WU CUN-KAI <br/><p>Continuously tunable second harmonic generation of 294.8-282.5 nm was obtained by Q-switched YAG laser pumped Rh·6G dye laser in a 45°cut β-BaB2O4 (BBO) crystal. The output energy of the harmonic wave is about 8mJ around 285 nm. The continuously tunable output over the range of 230.8-223.2 nm was also obtained by the sum frequency mixing between the residual pump fundamental wave (1064nm) and the second harmonic wave of Rh 6G dye laser in an other 45°cut BBO crystal. The sum frequency output energy is about 120 μJ around 226 nm, the corresponding peak power is 12 kW. The key techniques of the sura frequency generation were indicated.</p> <br/>Acta Physica Sinica. 1990 39(2): 190-193. Published 1990-01-05 Author(s): LU SHI-PING, YUAN YI-QIAN, YANG LI-SHU, WU CUN-KAI <br/><p>Continuously tunable second harmonic generation of 294.8-282.5 nm was obtained by Q-switched YAG laser pumped Rh·6G dye laser in a 45°cut β-BaB2O4 (BBO) crystal. The output energy of the harmonic wave is about 8mJ around 285 nm. The continuously tunable output over the range of 230.8-223.2 nm was also obtained by the sum frequency mixing between the residual pump fundamental wave (1064nm) and the second harmonic wave of Rh 6G dye laser in an other 45°cut BBO crystal. The sum frequency output energy is about 120 μJ around 226 nm, the corresponding peak power is 12 kW. The key techniques of the sura frequency generation were indicated.</p> <br/>Acta Physica Sinica. 1990 39(2): 190-193. Published 1990-01-05 HIGH POWER SUM FREQUENCY GENERATION OF 230.8—223.2nm IN BBO CRYSTAL LU SHI-PING, YUAN YI-QIAN, YANG LI-SHU, WU CUN-KAI 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 190-193. article doi:10.7498/aps.39.190 10.7498/aps.39.190 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.190 190-193 //www.getgobooth.com/en/article/doi/10.7498/aps.39.194 Author(s): ZHAN YUAN-LING, WANG LI <br/><p>A new method is presented for predicting the distribution of vector scattered fields of multilayer optical coatings. The scattering properties of film stacks with various interface cross-correlation models are discussed according to the statistical principles. The theory has been related to the familiar concepts of thin film optics, and simple results are obtained. It is shown theoretically that even though the optical parameters of the multilayer optical coatings are the same, the scattering losses can be quite different due to the different interface cross-correlations. Measurements of the scattered field distribution of optical films have also been made, and from them the interface cross-correlations of the multilayer optical films are determined according to the vector scattering theory.</p> <br/>Acta Physica Sinica. 1990 39(2): 194-203. Published 1990-01-05 Author(s): ZHAN YUAN-LING, WANG LI <br/><p>A new method is presented for predicting the distribution of vector scattered fields of multilayer optical coatings. The scattering properties of film stacks with various interface cross-correlation models are discussed according to the statistical principles. The theory has been related to the familiar concepts of thin film optics, and simple results are obtained. It is shown theoretically that even though the optical parameters of the multilayer optical coatings are the same, the scattering losses can be quite different due to the different interface cross-correlations. Measurements of the scattered field distribution of optical films have also been made, and from them the interface cross-correlations of the multilayer optical films are determined according to the vector scattering theory.</p> <br/>Acta Physica Sinica. 1990 39(2): 194-203. Published 1990-01-05 VECTOR SCATTERING THEORY AND EXPERIMENTS FOR MULTILAYER OPTICAL COATINGS ZHAN YUAN-LING, WANG LI 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 194-203. article doi:10.7498/aps.39.194 10.7498/aps.39.194 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.194 194-203 //www.getgobooth.com/en/article/doi/10.7498/aps.39.204 Author(s): HE KAI-FEN, A. SALAT <br/><p>In ref. [I] , numerical experiment reveals scaled superstructures In the bifurcation diagram for the damped nonlinear drift-wave driven by a traveling wave. In this paper, it is shown that the resonance between the solution of driv en-damped equation and that of the unperturbed system is the cause of winding number bifurcation and hence of the superstructure. The scaling law for the wavenumbers and frequencies calculated accordingly is in agreement with the numerical results.</p> <br/>Acta Physica Sinica. 1990 39(2): 204-211. Published 1990-01-05 Author(s): HE KAI-FEN, A. SALAT <br/><p>In ref. [I] , numerical experiment reveals scaled superstructures In the bifurcation diagram for the damped nonlinear drift-wave driven by a traveling wave. In this paper, it is shown that the resonance between the solution of driv en-damped equation and that of the unperturbed system is the cause of winding number bifurcation and hence of the superstructure. The scaling law for the wavenumbers and frequencies calculated accordingly is in agreement with the numerical results.</p> <br/>Acta Physica Sinica. 1990 39(2): 204-211. Published 1990-01-05 WINDING NUMBER BIFURCATION AND SUPERSTRUCTURE IN NONLINEAR DRIFT WAVES DRIVEN BY A TRAVELING WAVE HE KAI-FEN, A. SALAT 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 204-211. article doi:10.7498/aps.39.204 10.7498/aps.39.204 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.204 204-211 //www.getgobooth.com/en/article/doi/10.7498/aps.39.212 Author(s): LIU WAN-DONG, WEN YI-ZHI, WAN SHU-DE, YU CHANG-XUAN <br/><p>In this paper, the research results of the relations between the excitation stage of linear ion Bernstein wave (IBW) and the edge ion density fluctuation, the discharge parameters of tokamak and the antenna position in KT-5B tokamak are presented. The experiments show that large edge ion density fluctuation will make it difficult to excite IBW, the ranges of discharge parameters for optimally exciting IBW are consistent with those for normal operation of KT-5B tokamak. We find that for our toroidal current antenna, there may exist two ways of excitation, i.e. direct excitation and excitation through the electrostatic mode conversion process.</p> <br/>Acta Physica Sinica. 1990 39(2): 212-217. Published 1990-01-05 Author(s): LIU WAN-DONG, WEN YI-ZHI, WAN SHU-DE, YU CHANG-XUAN <br/><p>In this paper, the research results of the relations between the excitation stage of linear ion Bernstein wave (IBW) and the edge ion density fluctuation, the discharge parameters of tokamak and the antenna position in KT-5B tokamak are presented. The experiments show that large edge ion density fluctuation will make it difficult to excite IBW, the ranges of discharge parameters for optimally exciting IBW are consistent with those for normal operation of KT-5B tokamak. We find that for our toroidal current antenna, there may exist two ways of excitation, i.e. direct excitation and excitation through the electrostatic mode conversion process.</p> <br/>Acta Physica Sinica. 1990 39(2): 212-217. Published 1990-01-05 EXCITATION CONDITIONS OF ION BERNSTEIN WAVE IN KT-5B TOKAMAK LIU WAN-DONG, WEN YI-ZHI, WAN SHU-DE, YU CHANG-XUAN 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 212-217. article doi:10.7498/aps.39.212 10.7498/aps.39.212 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.212 212-217 //www.getgobooth.com/en/article/doi/10.7498/aps.39.218 Author(s): BIAN BO-DA, LIN JING, GUO SHI-CHONG, CAI SHI-DONG <br/><p>The effects of weakly felativistic trapped electrons on whistler instability in the magnetic-mirror configuration are studied. Using the simplified box model(1) the eigen equation is solved with perturbative approach including the weakly relativistic trapped effects. It is found that whistler instability can be driven by the anisotropic hot electrons, while relativisity increases the threshold value of instability and descreases the growth rate as well as makes the unstable modes shifting to low frequency.</p> <br/>Acta Physica Sinica. 1990 39(2): 218-224. Published 1990-01-05 Author(s): BIAN BO-DA, LIN JING, GUO SHI-CHONG, CAI SHI-DONG <br/><p>The effects of weakly felativistic trapped electrons on whistler instability in the magnetic-mirror configuration are studied. Using the simplified box model(1) the eigen equation is solved with perturbative approach including the weakly relativistic trapped effects. It is found that whistler instability can be driven by the anisotropic hot electrons, while relativisity increases the threshold value of instability and descreases the growth rate as well as makes the unstable modes shifting to low frequency.</p> <br/>Acta Physica Sinica. 1990 39(2): 218-224. Published 1990-01-05 WHISTLER INSTABILITY WITH WEAKLY RELATIVISTIC TRAPPED ELECTRONS BIAN BO-DA, LIN JING, GUO SHI-CHONG, CAI SHI-DONG 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 218-224. article doi:10.7498/aps.39.218 10.7498/aps.39.218 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.218 218-224 //www.getgobooth.com/en/article/doi/10.7498/aps.39.225 Author(s): WEI MING-JIAN <br/><p>Double crystal diffractometer applied to measure SAXS is very satisfactory, since it has high resolving power and relatively small measure area. But for a long time it has not been used widely, because it has comparatively strong background which may cover the signal of SAXS. We point out that this background results from two kinds of its sources, one is the fluorescence come from the second crystal; the other is the effect of tail part of the rocking curye of crystal used. The contribution of the first source can be subtracted by a pulse height analyser. We present here a method that can subtract the effect of the tail part of rocking curve. Experiment domonstrates that this method is satisfactory.</p> <br/>Acta Physica Sinica. 1990 39(2): 225-230. Published 1990-01-05 Author(s): WEI MING-JIAN <br/><p>Double crystal diffractometer applied to measure SAXS is very satisfactory, since it has high resolving power and relatively small measure area. But for a long time it has not been used widely, because it has comparatively strong background which may cover the signal of SAXS. We point out that this background results from two kinds of its sources, one is the fluorescence come from the second crystal; the other is the effect of tail part of the rocking curye of crystal used. The contribution of the first source can be subtracted by a pulse height analyser. We present here a method that can subtract the effect of the tail part of rocking curve. Experiment domonstrates that this method is satisfactory.</p> <br/>Acta Physica Sinica. 1990 39(2): 225-230. Published 1990-01-05 MEASUREMENT OF SMALL ANGLE X-RAY SCATTERING WITH DOUBLE CRYSTAL DIFFRACTOMETER WEI MING-JIAN 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 225-230. article doi:10.7498/aps.39.225 10.7498/aps.39.225 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.225 225-230 //www.getgobooth.com/en/article/doi/10.7498/aps.39.231 Author(s): WU XIAO-JING, LI FANG-HUA, MA ZHE-SHENG, SHI NI-CHENG <br/><p>The one-dimensional incommensurate modulated structure of ankangite (Ba0.827(Ti5.827V2.294Cr0.053)O16), a mineral recently discovered in China, has been studied by electron diffraction. Its average structure belongs to tetragonal system and unit cell parameters of the average structure are a= 10.2?, c=2.96?. The modulated wave spreading along direction c has the wave length of λ = 2.30c. The features of electron diffraction patterns are analysed in detail. The possible mechanism of the incommensurate modulated structure in ankangite is discussed and a modulated structure model of vacancy-displacive type is proposed. The disorder structure caused by the difference among initial phases for displacement functions from place to place is discussed.</p> <br/>Acta Physica Sinica. 1990 39(2): 231-236. Published 1990-01-05 Author(s): WU XIAO-JING, LI FANG-HUA, MA ZHE-SHENG, SHI NI-CHENG <br/><p>The one-dimensional incommensurate modulated structure of ankangite (Ba0.827(Ti5.827V2.294Cr0.053)O16), a mineral recently discovered in China, has been studied by electron diffraction. Its average structure belongs to tetragonal system and unit cell parameters of the average structure are a= 10.2?, c=2.96?. The modulated wave spreading along direction c has the wave length of λ = 2.30c. The features of electron diffraction patterns are analysed in detail. The possible mechanism of the incommensurate modulated structure in ankangite is discussed and a modulated structure model of vacancy-displacive type is proposed. The disorder structure caused by the difference among initial phases for displacement functions from place to place is discussed.</p> <br/>Acta Physica Sinica. 1990 39(2): 231-236. Published 1990-01-05 ELECTRON DIFFRACTION STUDY OF THE ONE DIMENSIONAL INCOMMENSURATE MODULATED STRUCTURE IN ANKANGITE WU XIAO-JING, LI FANG-HUA, MA ZHE-SHENG, SHI NI-CHENG 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 231-236. article doi:10.7498/aps.39.231 10.7498/aps.39.231 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.231 231-236 //www.getgobooth.com/en/article/doi/10.7498/aps.39.237 Author(s): CHEN KE-MING, JIN GAO-LONG, SHENG CHI, ZHOU GAO-LIANG, JIANO WEI-DONG, ZHANG XIANG-JIU, YU MING-REN <br/><p>RHEED intensity oscillations in the process of MBE growth of Ge and Si on Si (100) and Si (111) substrates were observed. It is revealed that a finite-thick buffer layer can improve the surface flatness of Si substrates, and the employment of lower growth rate or growth interruption procedure can improve tke crystal quality of epilayers. During the growth of Ge and Si on Si (100), a single atomic layer mode RHEED intensity oscillation was observed along either [100] or [110] azimuthal direction, which is due to the existance of double domain (2×1)+(1×2) reconstruction on the surface. During the growth of Ge on Si (111) substrates, RHEED intensity oscillation show a bilayer mode observed along [112] azimuth, but a non-uniform periodicity along [110] azimuth. The oscillations for continuosly growing Ge-on either Si (100) or Si (111) could exist up to an epilayer thickness of 6ML, which corresponds to the critical thickness of pseudomorphic growth of Ge on Si.</p> <br/>Acta Physica Sinica. 1990 39(2): 237-244. Published 1990-01-05 Author(s): CHEN KE-MING, JIN GAO-LONG, SHENG CHI, ZHOU GAO-LIANG, JIANO WEI-DONG, ZHANG XIANG-JIU, YU MING-REN <br/><p>RHEED intensity oscillations in the process of MBE growth of Ge and Si on Si (100) and Si (111) substrates were observed. It is revealed that a finite-thick buffer layer can improve the surface flatness of Si substrates, and the employment of lower growth rate or growth interruption procedure can improve tke crystal quality of epilayers. During the growth of Ge and Si on Si (100), a single atomic layer mode RHEED intensity oscillation was observed along either [100] or [110] azimuthal direction, which is due to the existance of double domain (2×1)+(1×2) reconstruction on the surface. During the growth of Ge on Si (111) substrates, RHEED intensity oscillation show a bilayer mode observed along [112] azimuth, but a non-uniform periodicity along [110] azimuth. The oscillations for continuosly growing Ge-on either Si (100) or Si (111) could exist up to an epilayer thickness of 6ML, which corresponds to the critical thickness of pseudomorphic growth of Ge on Si.</p> <br/>Acta Physica Sinica. 1990 39(2): 237-244. Published 1990-01-05 RHEED INTENSITY OSCILLATIONS IN THE PROCESS OF MOLECULAR BEAM EPITAXY GROWTH OF Ge AND Si ON Si SUBSTRATES CHEN KE-MING, JIN GAO-LONG, SHENG CHI, ZHOU GAO-LIANG, JIANO WEI-DONG, ZHANG XIANG-JIU, YU MING-REN 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 237-244. article doi:10.7498/aps.39.237 10.7498/aps.39.237 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.237 237-244 //www.getgobooth.com/en/article/doi/10.7498/aps.39.245 Author(s): SHAO JUN, SHU GUANG-YU, XU HUA, CHENG ZHAO-NIAN, CHEN NIAN-YI <br/><p>Using the Tosi-Fumi pair potential, we have performed simulations of the cooling of molten salt, lithium chloride, at the rate about 5×1012 Ks-1 to study the glass transition and the structural and dynamic properties of the simulated supercooled liquid. It can be seen from our calculation that over the range from 498K to 298K, the peak of the radial distribution function is split into two subpeaks, the self-diffusion cofficient decrease rapidly and the distribution of bond angle has a high peak. So the simulated glass transition temperature should occur ac this range. At 298K the first coordination number of Li+ or Cl- calculated from the cumulative coordination number curve N(r) is about 4. The simulation indicates the existence of microscopic holes in melt and glass. The relationship between the temperature and the number of holes is discussed.</p> <br/>Acta Physica Sinica. 1990 39(2): 245-253. Published 1990-01-05 Author(s): SHAO JUN, SHU GUANG-YU, XU HUA, CHENG ZHAO-NIAN, CHEN NIAN-YI <br/><p>Using the Tosi-Fumi pair potential, we have performed simulations of the cooling of molten salt, lithium chloride, at the rate about 5×1012 Ks-1 to study the glass transition and the structural and dynamic properties of the simulated supercooled liquid. It can be seen from our calculation that over the range from 498K to 298K, the peak of the radial distribution function is split into two subpeaks, the self-diffusion cofficient decrease rapidly and the distribution of bond angle has a high peak. So the simulated glass transition temperature should occur ac this range. At 298K the first coordination number of Li+ or Cl- calculated from the cumulative coordination number curve N(r) is about 4. The simulation indicates the existence of microscopic holes in melt and glass. The relationship between the temperature and the number of holes is discussed.</p> <br/>Acta Physica Sinica. 1990 39(2): 245-253. Published 1990-01-05 MOLECULAR DYNAMICS SIMULATIONS OF SUPERCOOLED LITHIUM CHLORIDE GLASS SHAO JUN, SHU GUANG-YU, XU HUA, CHENG ZHAO-NIAN, CHEN NIAN-YI 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 245-253. article doi:10.7498/aps.39.245 10.7498/aps.39.245 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.245 245-253 //www.getgobooth.com/en/article/doi/10.7498/aps.39.254 Author(s): LU WU-XING, QIAN YA-HONG, TIAN REN-HE, WANG ZHONG-LIE <br/><p>Thermal annealing behavior of secondary defects in silicon implanted with MeV energetic boron ions has been studied. We snggest a new type of enhanced annealing effect of donble implantation, which can be used effectively to suppress or eliminate the secondary defects in such implanted silicon samples. The physical mechanism of the suppression and elimination processes is discussed.</p> <br/>Acta Physica Sinica. 1990 39(2): 254-260. Published 1990-01-05 Author(s): LU WU-XING, QIAN YA-HONG, TIAN REN-HE, WANG ZHONG-LIE <br/><p>Thermal annealing behavior of secondary defects in silicon implanted with MeV energetic boron ions has been studied. We snggest a new type of enhanced annealing effect of donble implantation, which can be used effectively to suppress or eliminate the secondary defects in such implanted silicon samples. The physical mechanism of the suppression and elimination processes is discussed.</p> <br/>Acta Physica Sinica. 1990 39(2): 254-260. Published 1990-01-05 SUPPRESSION AND ELIMINATION OF SECONDARY DEFECTS IN SILICON IMPLANTED WITH MeV ENERGETIC B+ IONS LU WU-XING, QIAN YA-HONG, TIAN REN-HE, WANG ZHONG-LIE 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 254-260. article doi:10.7498/aps.39.254 10.7498/aps.39.254 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.254 254-260 //www.getgobooth.com/en/article/doi/10.7498/aps.39.261 Author(s): ZHANG BAO-ZHENG, LI YU-XING, LIN MEI-RONG, CHEN WEN-JU <br/><p>In this paper, with the assuption of effective lattice mode of coupling, a generalized theoretical expression of multiphonon relaxation rate has been derived by using quantum mechanical generating function method. An analytical rate expression is presented for high-order approximation case. Limitations of relaxation rate expressions in weak coupling approxamation given by Fong et al. with the quantum statistical method, and in weak coupling approximation and low temperature approximation given by Miyakawa et al. with quantum statistical method are pointed out. The dependence of the multiphonon relaxation rate on temperature, phonon. energy, energy gap and displacement parameter are also calculated.</p> <br/>Acta Physica Sinica. 1990 39(2): 261-269. Published 1990-01-05 Author(s): ZHANG BAO-ZHENG, LI YU-XING, LIN MEI-RONG, CHEN WEN-JU <br/><p>In this paper, with the assuption of effective lattice mode of coupling, a generalized theoretical expression of multiphonon relaxation rate has been derived by using quantum mechanical generating function method. An analytical rate expression is presented for high-order approximation case. Limitations of relaxation rate expressions in weak coupling approxamation given by Fong et al. with the quantum statistical method, and in weak coupling approximation and low temperature approximation given by Miyakawa et al. with quantum statistical method are pointed out. The dependence of the multiphonon relaxation rate on temperature, phonon. energy, energy gap and displacement parameter are also calculated.</p> <br/>Acta Physica Sinica. 1990 39(2): 261-269. Published 1990-01-05 THEORETICAL STUDY OF MULTIPHONON RADIATIONLESS RELAXATION RATE ZHANG BAO-ZHENG, LI YU-XING, LIN MEI-RONG, CHEN WEN-JU 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 261-269. article doi:10.7498/aps.39.261 10.7498/aps.39.261 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.261 261-269 //www.getgobooth.com/en/article/doi/10.7498/aps.39.270 Author(s): LI LE, LIU YANG-HUA, YU GONG-DA, WANG WEN-CHENG, ZHANG ZHI-MING <br/><p>In this paper, we report the discussion on the nonlinear optical properties of an oxygen-covered Ag as well as the experimental studies with optical secondharmonic generation (SHG) in an ultrahigh vacuum system. The resulted SH signals are found to be very sensitive to the charge transfer between oxygen and silver. Based on the SHG measurement of oxygen adsorption dynamics, we seggest that the unmber of electrons donated to silver from the π-filled orbital might be more than that transfered from silver to the π* anti-bonding orbital of adsorbed oxygen molecules. Besides, the temperature programmed dissociation of adsorbed oxygen molecules was investigated, which could be explained in the framework of a simple model.</p> <br/>Acta Physica Sinica. 1990 39(2): 270-277. Published 1990-01-05 Author(s): LI LE, LIU YANG-HUA, YU GONG-DA, WANG WEN-CHENG, ZHANG ZHI-MING <br/><p>In this paper, we report the discussion on the nonlinear optical properties of an oxygen-covered Ag as well as the experimental studies with optical secondharmonic generation (SHG) in an ultrahigh vacuum system. The resulted SH signals are found to be very sensitive to the charge transfer between oxygen and silver. Based on the SHG measurement of oxygen adsorption dynamics, we seggest that the unmber of electrons donated to silver from the π-filled orbital might be more than that transfered from silver to the π* anti-bonding orbital of adsorbed oxygen molecules. Besides, the temperature programmed dissociation of adsorbed oxygen molecules was investigated, which could be explained in the framework of a simple model.</p> <br/>Acta Physica Sinica. 1990 39(2): 270-277. Published 1990-01-05 MODIFICATION OF THE SURFACE SECOND-HARMONIC GENERATION FROM AN OXYGEN-COVERED SILVER BY THE OXYGEN-SILVER INTERACTION LI LE, LIU YANG-HUA, YU GONG-DA, WANG WEN-CHENG, ZHANG ZHI-MING 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 270-277. article doi:10.7498/aps.39.270 10.7498/aps.39.270 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.270 270-277 //www.getgobooth.com/en/article/doi/10.7498/aps.39.278 Author(s): XU JIAN-HUA <br/><p>The electronic structures of Al3Y in the three (DO19, Ll2, and DO22) phases were investigated using the allelectron total energy self-consistent LMTO method. The calculated results for total energy showed that the hexagonal DO19 phase is the most stable structure among these three phases, this is in agreement with experiment. Furthermore, it is found that the stability depends strongly upon the band filling of the bonding states and exhibits a inverse relationship with the density of states at EF.</p> <br/>Acta Physica Sinica. 1990 39(2): 278-281. Published 1990-01-05 Author(s): XU JIAN-HUA <br/><p>The electronic structures of Al3Y in the three (DO19, Ll2, and DO22) phases were investigated using the allelectron total energy self-consistent LMTO method. The calculated results for total energy showed that the hexagonal DO19 phase is the most stable structure among these three phases, this is in agreement with experiment. Furthermore, it is found that the stability depends strongly upon the band filling of the bonding states and exhibits a inverse relationship with the density of states at EF.</p> <br/>Acta Physica Sinica. 1990 39(2): 278-281. Published 1990-01-05 ELECTRONIC STRUCTURE AND CRYSTAL STRUCTURE IN Al3Y XU JIAN-HUA 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 278-281. article doi:10.7498/aps.39.278 10.7498/aps.39.278 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.278 278-281 //www.getgobooth.com/en/article/doi/10.7498/aps.39.282 Author(s): WANG REN-ZHI, HUANG MEI-CHUN <br/><p>Ab initio calculations of optical-phonon deformation potentials (ODP)d30, d10 (val) and d10 (cond) on Λ-axis in Brillioun zone for the compounds GaAs and AlAs are reported. The study is based on a frozenphonon model and using the LMTO-ASA method with a frozen-potential approximation, in which the displacement of the empty sphere was considered +o match its atomic sphere partners. The validity of our method and results have been verified with the aid of calculations for wave-vector dependence of the ODPs on Λ-asix, the numerical test to the expressions about d0 VS d30 and d10 VS d10 (val) near Γ point and an extensive comprison with various calculations as well as the experiment.</p> <br/>Acta Physica Sinica. 1990 39(2): 282-288. Published 1990-01-05 Author(s): WANG REN-ZHI, HUANG MEI-CHUN <br/><p>Ab initio calculations of optical-phonon deformation potentials (ODP)d30, d10 (val) and d10 (cond) on Λ-axis in Brillioun zone for the compounds GaAs and AlAs are reported. The study is based on a frozenphonon model and using the LMTO-ASA method with a frozen-potential approximation, in which the displacement of the empty sphere was considered +o match its atomic sphere partners. The validity of our method and results have been verified with the aid of calculations for wave-vector dependence of the ODPs on Λ-asix, the numerical test to the expressions about d0 VS d30 and d10 VS d10 (val) near Γ point and an extensive comprison with various calculations as well as the experiment.</p> <br/>Acta Physica Sinica. 1990 39(2): 282-288. Published 1990-01-05 FIRST PRINCIPLE STUDY OF OPTICAL-PHONON DEFORMA-TION POTENTIALS ON Λ-AXIS FOR GaAs AND AlAs WANG REN-ZHI, HUANG MEI-CHUN 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 282-288. article doi:10.7498/aps.39.282 10.7498/aps.39.282 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.282 282-288 //www.getgobooth.com/en/article/doi/10.7498/aps.39.289 Author(s): LU DING-WEI, SUN XIN, FU ROU-LI, LIU JIE <br/><p>The existing theory points out that the soliton in polyacetylene only possess one electronic bound state-the mid gap state. Our work shows that, due to the electron interaction and the discrete atomic structure of polymer chain, the charged solitons have two bound states in the gap; one is a deep level, which is 0.2eV away from the midpoint of the gap; the other is a shallow level 0.06eV apart from the band edges. Our theory agrees with the photo-induced absorption in trans-(CH)x.</p> <br/>Acta Physica Sinica. 1990 39(2): 289-295. Published 1990-01-05 Author(s): LU DING-WEI, SUN XIN, FU ROU-LI, LIU JIE <br/><p>The existing theory points out that the soliton in polyacetylene only possess one electronic bound state-the mid gap state. Our work shows that, due to the electron interaction and the discrete atomic structure of polymer chain, the charged solitons have two bound states in the gap; one is a deep level, which is 0.2eV away from the midpoint of the gap; the other is a shallow level 0.06eV apart from the band edges. Our theory agrees with the photo-induced absorption in trans-(CH)x.</p> <br/>Acta Physica Sinica. 1990 39(2): 289-295. Published 1990-01-05 ELECTRONIC BOUND STATES OF CHARGED SOLITON LU DING-WEI, SUN XIN, FU ROU-LI, LIU JIE 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 289-295. article doi:10.7498/aps.39.289 10.7498/aps.39.289 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.289 289-295 //www.getgobooth.com/en/article/doi/10.7498/aps.39.296 Author(s): NIE XIANG-FU, TANG GUI-DE, NIU XIOU-DE, HAN BAO-SHAN <br/><p>The criterion of classification for three kinds of hard domains with lots of VBLS in their walls in garnet bubble materials is proposed. Their formation and static characteristics are described in detail and their typical pictures are shown. Considering the formation conditions of hard domains, it is reasonable to deduce that the increase of the number of VBLs in their walls leads to substantial change of their static characteristics.</p> <br/>Acta Physica Sinica. 1990 39(2): 296-301. Published 1990-01-05 Author(s): NIE XIANG-FU, TANG GUI-DE, NIU XIOU-DE, HAN BAO-SHAN <br/><p>The criterion of classification for three kinds of hard domains with lots of VBLS in their walls in garnet bubble materials is proposed. Their formation and static characteristics are described in detail and their typical pictures are shown. Considering the formation conditions of hard domains, it is reasonable to deduce that the increase of the number of VBLs in their walls leads to substantial change of their static characteristics.</p> <br/>Acta Physica Sinica. 1990 39(2): 296-301. Published 1990-01-05 FORMATION AND STATIC CHARACTERISTICS OF THREE KINDS OF HARD DOMAINS IN BUBBLE MATERIALS NIE XIANG-FU, TANG GUI-DE, NIU XIOU-DE, HAN BAO-SHAN 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 296-301. article doi:10.7498/aps.39.296 10.7498/aps.39.296 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.296 296-301 //www.getgobooth.com/en/article/doi/10.7498/aps.39.302 Author(s): MO DANG, ZHANG GUI-LIN, L. NIESEN, H. DE WAARD <br/><p>A new type of M?ssbauer spectroscopy-time-dependent M?ssbauer spectroscopy isproposed and realized on the basis of using two-step decay 119mTe→119Sb→119Sn.For the GaAs samples, implanted with dose of 110keV 119mTe + 1015 stable Te/cm2 and annealed at 600℃, the relative intensities of various lines of the M?ssbauer spectra have been measured as functions of ξ, a parameter being equal to ΦTe/ΦTo+a1 by definition ξ itself is determined from the annealing time ta, the initial time ti and the final time tf of the measurement of each spectrum. This kind of time-dependent M?ssbauer spectroscopy can be used to investigate the change of the environment of the probe atoms in solid. The lines of M?ssbauer spectra have been identified. The problem of the environment change of Te atom in GaAs after its decay into Sb and the mechanism of the non-substitutional Te have been discussed. Our experimental results are also compared with previous data taken from M?ssbauer spectra of 125Te and 129Te in GaAs.</p> <br/>Acta Physica Sinica. 1990 39(2): 302-311. Published 1990-01-05 Author(s): MO DANG, ZHANG GUI-LIN, L. NIESEN, H. DE WAARD <br/><p>A new type of M?ssbauer spectroscopy-time-dependent M?ssbauer spectroscopy isproposed and realized on the basis of using two-step decay 119mTe→119Sb→119Sn.For the GaAs samples, implanted with dose of 110keV 119mTe + 1015 stable Te/cm2 and annealed at 600℃, the relative intensities of various lines of the M?ssbauer spectra have been measured as functions of ξ, a parameter being equal to ΦTe/ΦTo+a1 by definition ξ itself is determined from the annealing time ta, the initial time ti and the final time tf of the measurement of each spectrum. This kind of time-dependent M?ssbauer spectroscopy can be used to investigate the change of the environment of the probe atoms in solid. The lines of M?ssbauer spectra have been identified. The problem of the environment change of Te atom in GaAs after its decay into Sb and the mechanism of the non-substitutional Te have been discussed. Our experimental results are also compared with previous data taken from M?ssbauer spectra of 125Te and 129Te in GaAs.</p> <br/>Acta Physica Sinica. 1990 39(2): 302-311. Published 1990-01-05 TIME DEPENDENT M?SSBAUER SPECTROSCOPY AND 119mTe IMPLANTED GaAs MO DANG, ZHANG GUI-LIN, L. NIESEN, H. DE WAARD 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 302-311. article doi:10.7498/aps.39.302 10.7498/aps.39.302 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.302 302-311 //www.getgobooth.com/en/article/doi/10.7498/aps.39.312 Author(s): ZHANG SI-YUAN, REN JIN-SHENG <br/><p>In this paper, the radiative transition probability, non-radiative transition probability, cross relaxation probability and other spectral parameters are calculated in detail. By considering three kinds of radiative processes, the fluorecent dynamic process is discussed, the relations between the fluorescent character and the concentrations of Er3+ ions are studied, and their laws are given.</p> <br/>Acta Physica Sinica. 1990 39(2): 312-318. Published 1990-01-05 Author(s): ZHANG SI-YUAN, REN JIN-SHENG <br/><p>In this paper, the radiative transition probability, non-radiative transition probability, cross relaxation probability and other spectral parameters are calculated in detail. By considering three kinds of radiative processes, the fluorecent dynamic process is discussed, the relations between the fluorescent character and the concentrations of Er3+ ions are studied, and their laws are given.</p> <br/>Acta Physica Sinica. 1990 39(2): 312-318. Published 1990-01-05 INVESTIGATION OF FLUORESCENT DYNAMICS ON ErxY1-xAlO3 CRYSTALS ZHANG SI-YUAN, REN JIN-SHENG 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 312-318. article doi:10.7498/aps.39.312 10.7498/aps.39.312 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.312 312-318 //www.getgobooth.com/en/article/doi/10.7498/aps.39.319 Author(s): PAN ZHENG-YING, CHEN JIAN-XIN, WU SHI-MING, HUO YU-KUN <br/><p>Based upon the binary collision approximation (BCA), the Monte Carlo methods are employed to study sputtering of multi-component amorphous targets. Total and partial sputtering yields, energy and angular distribution and the escape depth distribution of sputtered particles are given. The changes of surface concentrations are also studied The results indicate that the collisional effect may account for the preferential sputtering, which plays an important role in surface composition changes due to ion bombardment.</p> <br/>Acta Physica Sinica. 1990 39(2): 319-324. Published 1990-01-05 Author(s): PAN ZHENG-YING, CHEN JIAN-XIN, WU SHI-MING, HUO YU-KUN <br/><p>Based upon the binary collision approximation (BCA), the Monte Carlo methods are employed to study sputtering of multi-component amorphous targets. Total and partial sputtering yields, energy and angular distribution and the escape depth distribution of sputtered particles are given. The changes of surface concentrations are also studied The results indicate that the collisional effect may account for the preferential sputtering, which plays an important role in surface composition changes due to ion bombardment.</p> <br/>Acta Physica Sinica. 1990 39(2): 319-324. Published 1990-01-05 MONTE CARLO CALCULATION OF PREFERENTIAL SPUTTE-RING IN MULTI-COMPONENT TARGET PAN ZHENG-YING, CHEN JIAN-XIN, WU SHI-MING, HUO YU-KUN 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 319-324. article doi:10.7498/aps.39.319 10.7498/aps.39.319 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.319 319-324 //www.getgobooth.com/en/article/doi/10.7498/aps.39.325 Author(s): WANG QIANG, GU BING-LIN, ZHANG XIAO-WEN <br/><p>By use of cluster variation method, a study of orderdisorder transition in A+2(B1/31B2/32)O3 system was carried out. Theoretical calculation indicated that the interaction energy parameter J had a great influnce on formation of both, the (B2/31B1/32)1/2 :B1/22 =1:1 mixed ordered domain and B1/31:B2/32= 1:2 domain, and predicted that it was more difficult to form the B1/31:B2/32= 1:2 full ordered domain relatively to the (B2/31B1/32)1/2B1/22 = 1:1 mixed ordered domain.</p> <br/>Acta Physica Sinica. 1990 39(2): 325-336. Published 1990-01-05 Author(s): WANG QIANG, GU BING-LIN, ZHANG XIAO-WEN <br/><p>By use of cluster variation method, a study of orderdisorder transition in A+2(B1/31B2/32)O3 system was carried out. Theoretical calculation indicated that the interaction energy parameter J had a great influnce on formation of both, the (B2/31B1/32)1/2 :B1/22 =1:1 mixed ordered domain and B1/31:B2/32= 1:2 domain, and predicted that it was more difficult to form the B1/31:B2/32= 1:2 full ordered domain relatively to the (B2/31B1/32)1/2B1/22 = 1:1 mixed ordered domain.</p> <br/>Acta Physica Sinica. 1990 39(2): 325-336. Published 1990-01-05 A STUDY ON THE ORDER-DISORDER TRANSITION IN A+2(B1/31B2/32)O3 PEROVSKITES WANG QIANG, GU BING-LIN, ZHANG XIAO-WEN 1990-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1990 39(2): 325-336. article doi:10.7498/aps.39.325 10.7498/aps.39.325 Acta Physica Sinica 39 2 1990-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.39.325 325-336

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