Table of contents

20 May 1996, Volume 5 Issue 5 Previous issue    Next issue

ATOMIC AND MOLECULAR PHYSICS

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GENERAL JAHN-TELLER POTENTIALS WITH MANY ELECTRONS CHEN FENG (陈峰), LI WEN-ZHU (李文铸) Acta Physica Sinica (Overseas Edition), 1996, 5 (5):  321-329.  DOI: 10.1088/1004-423X/5/5/001 Abstract ( 1148 )   PDF (193KB) ( 306 )   The present paper investigates the Jahn-Teller theory for the case that the degenerate molecular energy level is occupied by many electrons. The Oepik-Pryce treatment and the isostationary function method are used to determine the structure of the Jahn-Teller potential, whose symmetric properties are discussed. Examples are given for $\varGamma$×($\varLambda$1 + $\varLambda$2) Jahn-Teller problems.

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COMPETITION EFFECT IN ATOMIC-MOLECULAR SYSTEM JIA SUO-TANG (贾锁堂), QIN LI-JUAN (秦莉娟), QIAN ZU-LIANG (钱祖良), WANG ZU-GENG (王祖赓), WANG GANG (王钢), ZHOU GUO-SHENG (周国生) Acta Physica Sinica (Overseas Edition), 1996, 5 (5):  330-336.  DOI: 10.1088/1004-423X/5/5/002 Abstract ( 1007 )   PDF (201KB) ( 433 )   The competition effects among the processes that occur in the two-photon 3S→4D excitation of Na atom in Na-Na2 vapour mixture are observed: such as atomic ionization, optical-pumped stimulated radiation, four-wave frequency mixing and molecular stimulated diffuse-band radiation, etc. The dip at the two-photon resonance in the excitation spectrum for the diffuse-band radiation under high temperature condition is interpreted as the suppression of population in 4D state.

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STUDY OF THREE-PHOTON RESONANCE MULTIPHOTON IONIZATION SPECTROSCOPY OF 3p RYDBERG STATES OF m-DIMETHYLBENZENE WITHIN DYE Rh560 LIU YAO-MING (刘耀明), LIN MEI-RONG (林美荣), ZHAO QING-CHUN (赵青春), ZHANG BAO-ZHENG (张包铮), CHEN WEN-JU (陈文驹) Acta Physica Sinica (Overseas Edition), 1996, 5 (5):  337-342.  DOI: 10.1088/1004-423X/5/5/003 Abstract ( 1226 )   PDF (153KB) ( 353 )   In this paper, we studied experimentally the three-photon resonance four-photon ionization spectroscopy of m-dimethylbenzene within dye Rh560. We found several new 3p Rydberg vibronie states and measured their polarization characters. With the help of the measured polarization quantities, we gave the assignment results of these vibronic states: 9b01, A1; 1301, A1; 19a01, A1; 8a01, A1.

CLASSICAL AREAS OF PHENOMENOLOGY

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APPROXIMATION THEORY OF OSCILLATING FACTOR SUPPRESSING AMPLITUDE IN QUANTUM PROCESS AND ITS APPLICATIONS SUN CHANG-PU (孙昌璞), LIU XIA-JI (刘夏姬) Acta Physica Sinica (Overseas Edition), 1996, 5 (5):  343-353.  DOI: 10.1088/1004-423X/5/5/004 Abstract ( 1008 )   PDF (220KB) ( 377 )   The oscillating factor suppressing amplitude approximation is proposed in this paper as a basic method to study the evolution of a quantum system. By making use of this method, not only the quantum adiabatic approximation is described again, But also both the higher-order corrections for the rotation wave approximation and the influences of other levels on two-level approximation can be analytically investigated with the explicit discussion for the quantitative conditions under which the two approximations hold.

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DESIGN OF DIFFRACTIVE-PHASE AXICON ILLUMINATED BY A GAUSSIAN-PROFILE BEAM ZHANG GUO-QING (张国庆), DONG BI-ZHEN (董碧珍), YANG GUO-ZHEN (杨国桢), GU BEN-YUAN (顾本源) Acta Physica Sinica (Overseas Edition), 1996, 5 (5):  354-364.  DOI: 10.1088/1004-423X/5/5/005 Abstract ( 1511 )   PDF (370KB) ( 506 )   The diffractive-phase axicon can convert the Gaussian-profile beam into axial uniform intensity distribution with long focal depth and high lateral resolution. Two types of phase-retardation functions for the nonuniform-illuminating axicon are derived in terms of the ray tracing and the geometrical law of energy conservation. Based on the general theory of the amplitude-phase retrieval in optical system and the iteration algorithm, the optimization design of the phase distribution of the diffractive-phase axicon can be achieved. The simulation celculations show that the new approach may successfully offer the design of the desired diffractive-phase axicon with long focal depth and high lateral resolution. A comparison of the performances of the holographic axicon with the phase-retardation functions from the geometrical optics prediction and the diffractive-phase axicon designed by the new approach is also presented.

CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES

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EFFECTS OF THE QUALITY OF SUBSTRATE ON THE STRUCTURE AND SUPERCONDUCTING PROPERTIES OF Yba2Cu3O7-x THIN FILM Lü HUI-BIN (吕惠宾), XU SHI-FA (许世发), TIAN YONG-JUN (田永君), ZHOU YUE-LIANG (周岳亮), CUI DA-FU (崔大复), CHEN ZHENG-HAO (陈正豪), LIU JUN-ZHENG (刘军政), HE MENG (何萌), LI LIN (李林), YANG GUO-ZHEN (杨国桢), LU JIAN (卢剑), REN XIANG-YANG (任向阳), ZHANG QI-SHAO (张其劭), LIU AN-SHENG (刘安生), SUN LI-HONG (孙丽虹) Acta Physica Sinica (Overseas Edition), 1996, 5 (5):  365-369.  DOI: 10.1088/1004-423X/5/5/006 Abstract ( 1170 )   PDF (141KB) ( 398 )   We have systematically investigated the structures, morphologies, microwave surface resistance, DC performances and the substrate qualities of three YBa2Cu3O7-x(YBCO) thin films 30mm in diameter. The three samples deposited by the same process have been proved of different properties. It has been shown that the structure and superconducting properties of the thin film depend strongly on the quality of substrate.

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STUDY OF MOLECULAR BEAM EPITAXIAL GROWTH AND OPTICAL CHARACTERISTICS OF HgCdTe GUO SHI-PING (郭世平), ZHANG JIA-MING (张家明), LIU PU-LIN (刘普霖), SHEN XUE-CHU (沈学础), YUAN SHI-XIN (袁诗鑫), J.W. TOMM Acta Physica Sinica (Overseas Edition), 1996, 5 (5):  370-376.  DOI: 10.1088/1004-423X/5/5/007 Abstract ( 1097 )   PDF (207KB) ( 465 )   HgCdTe epilayers were grown by molecular beam epitaxy on GaAs(211)B substrates. Process of the HgCdTe epitaxial growth can be monitored by reflection high-energy electron diffraction. Results of the infrared transmission spectrum, Raman scattering spectrum and infrared photoluminescence spectrum in magnetic field have been studied.

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

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THIRD-ORDER NONLINEAR OPTICAL PROPERTIES OF SnO2 NANOPARTICLES YU BAO-LONG (余保龙), ZHANG GUI-LAN (张桂兰), TANG GUO-QING (汤国庆), WU XIAO-CHUN (吴晓春), CHEN WEN-JU (陈文驹), YANG BIN-ZHOU (杨斌洲), ZHAO PING (赵平) Acta Physica Sinica (Overseas Edition), 1996, 5 (5):  377-383.  DOI: 10.1088/1004-423X/5/5/008 Abstract ( 1283 )   PDF (163KB) ( 611 )   We have measured the third-order nonlinear susceptibilities $\chi$(3) of SnO2 nanoparticles both naked and coated with a layer of stearic acid by using Z-scan technique with 1.06μm pulse from a Q-switched Nd:YAG laser. The results show that the $\chi$(3) of these nanoparticles is much larger than that of the bulk material. Moreover, we find that two-photon absorption is not present for the naked nanoparticles but it is preseut for the coated ones, and the $\chi$(3) of the latter is larger than that of the former. It is demonstrated that the surface situations of the nanoparticles have great influence on their nonlinear optical properties.

CROSS DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY

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PULSED LASER DEPOSITION AND CHARACTERIZATION OF FERHOELECTHIC Pb(Zr, Ti)O3 THIN FILMS ON SILICON-ON-INSULATOR SUBSTRATES ZHENG LI-RONG (郑立荣), ZHANG SHUN-KAI (张顺开), LIN CHENG-LU (林成鲁) Acta Physica Sinica (Overseas Edition), 1996, 5 (5):  384-390.  DOI: 10.1088/1004-423X/5/5/009 Abstract ( 839 )   PDF (183KB) ( 325 )   Ferroelectric Pb(Zr, Ti)O3 thin films were prepared by pulsed exeimer laser deposition on silicon-on-insulator and Pt-coated silicon-on-insulator substrates, and rapid thermal annealing was per-formed to crystallize the films, Based on the analysis by X-ray diffraction, Rutherford backscattering spectroscopy and measurements of electrical properties, the films were revealed to be polycrystalline perovskite structure with mainly (100) and (110) orientations, and their crystallization was found to be dependent on annealing temperature and annealing time. The films show good ferroelectricity, with Pr=15μC/cm2, Ec= 50kV/cm, high resistivity and high dielectric constant.