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Chin. Phys. B  
  Chin. Phys. B--1996, Vol.5, No.5
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ATOMIC AND MOLECULAR PHYSICS

GENERAL JAHN-TELLER POTENTIALS WITH MANY ELECTRONS

CHEN FENG, LI WEN-ZHU
Chin. Phys. B 1996, 5 (5): 0321;  doi: 10.1088/1004-423X/5/5/001
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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 Γ×(Λ1 + Λ2) Jahn-Teller problems.

COMPETITION EFFECT IN ATOMIC-MOLECULAR SYSTEM

JIA SUO-TANG, QIN LI-JUAN, QIAN ZU-LIANG, WANG ZU-GENG, WANG GANG, ZHOU GUO-SHENG
Chin. Phys. B 1996, 5 (5): 0330;  doi: 10.1088/1004-423X/5/5/002
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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.

STUDY OF THREE-PHOTON RESONANCE MULTIPHOTON IONIZATION SPECTROSCOPY OF 3p RYDBERG STATES OF m-DIMETHYLBENZENE WITHIN DYE Rh560

LIU YAO-MING, LIN MEI-RONG, ZHAO QING-CHUN, ZHANG BAO-ZHENG, CHEN WEN-JU
Chin. Phys. B 1996, 5 (5): 0337;  doi: 10.1088/1004-423X/5/5/003
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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

APPROXIMATION THEORY OF OSCILLATING FACTOR SUPPRESSING AMPLITUDE IN QUANTUM PROCESS AND ITS APPLICATIONS

SUN CHANG-PU, LIU XIA-JI
Chin. Phys. B 1996, 5 (5): 0343;  doi: 10.1088/1004-423X/5/5/004
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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.

DESIGN OF DIFFRACTIVE-PHASE AXICON ILLUMINATED BY A GAUSSIAN-PROFILE BEAM

ZHANG GUO-QING, DONG BI-ZHEN, YANG GUO-ZHEN, GU BEN-YUAN
Chin. Phys. B 1996, 5 (5): 0354;  doi: 10.1088/1004-423X/5/5/005
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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

EFFECTS OF THE QUALITY OF SUBSTRATE ON THE STRUCTURE AND SUPERCONDUCTING PROPERTIES OF Yba2Cu3O7-x THIN FILM

Lü HUI-BIN, XU SHI-FA, TIAN YONG-JUN, ZHOU YUE-LIANG, CUI DA-FU, CHEN ZHENG-HAO, LIU JUN-ZHENG, HE MENG, LI LIN, YANG GUO-ZHEN, LU JIAN, REN XIANG-YANG, ZHANG QI-SHAO, LIU AN-SHENG, SUN LI-HONG
Chin. Phys. B 1996, 5 (5): 0365;  doi: 10.1088/1004-423X/5/5/006
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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.

STUDY OF MOLECULAR BEAM EPITAXIAL GROWTH AND OPTICAL CHARACTERISTICS OF HgCdTe

GUO SHI-PING, ZHANG JIA-MING, LIU PU-LIN, SHEN XUE-CHU, YUAN SHI-XIN
Chin. Phys. B 1996, 5 (5): 0370;  doi: 10.1088/1004-423X/5/5/007
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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

THIRD-ORDER NONLINEAR OPTICAL PROPERTIES OF SnO2 NANOPARTICLES

YU BAO-LONG, ZHANG GUI-LAN, TANG GUO-QING, WU XIAO-CHUN, CHEN WEN-JU, YANG BIN-ZH0U, ZHAO PING
Chin. Phys. B 1996, 5 (5): 0377;  doi: 10.1088/1004-423X/5/5/008
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We have measured the third-order nonlinear susceptibilities χ(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 χ(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 χ(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.
8000 CROSSDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY
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