Chin. Phys. B
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CN 11-5639/O4
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Chin. Phys. B  
  Chin. Phys. B--1998, Vol.7, No.3
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CLASSICAL AREAS OF PHENOMENOLOGY

PREPARATION OF NONCLASSICAL STATES OF A CAVITY FIELD BASED ON A NONLINEAR JAYNES-CUMMINGS MODEL

WEI WEI, GUO GUANG-CAN
Acta Phys. Sin. (Overseas Edition), 1998, 7 (3): 174-182 doi: 10.1088/1004-423X/7/3/004
Full Text: [PDF 213 KB] (Downloads:259)
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It is proven in this paper that some kinds of nonclassical quantum states of the cavity field, such as Schr?dinger cat state (amplitude cat or phase cat), sub-Poissonian photon distribution and Fock state, etc., can be generated by conditional meas urements on atoms in the two-photon Jaynes-Cummings model with a Kerr-like medium. The nonlinear constant plays the key modulation role in the preparation of the quantum states, which gives a new controllable parameter for further experi mental researches in this field.

COHERENT STATES FOR ONE-DIMENSIONAL INFINITELY DEEP SQUARE POTENTIAL WELL

NI ZHI-XIANG
Acta Phys. Sin. (Overseas Edition), 1998, 7 (3): 183-189 doi: 10.1088/1004-423X/7/3/005
Full Text: [PDF 163 KB] (Downloads:277)
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The energy spectrum-generating algebra for one-dimensional infinitely deep square potential well is constructed by using an additional phase variable, and a class of sets of the annihilation operator coherent states are introduced. These sets are strongly continuous in their parameter on the whole complex plane and satisfy the overcompleteness relation in a curved parameter space with rotational symmetry.

PHOTO ACOUSTIC MEASUREMENTS OF WATER VAPOR ABSORPTION COEFFICIENT IN UV SPECTRAL REGION

B.A.TIKHOMIROV, V.O.TROI TSKII, V.A.KAPITANOV, G.S.EVTUSHENKO, Y.N.PONOMAREV
Acta Phys. Sin. (Overseas Edition), 1998, 7 (3): 190-195 doi: 10.1088/1004-423X/7/3/006
Full Text: [PDF 165 KB] (Downloads:330)
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Data on the absorption coefficient of H2O in binary mixture with N2 in UV region of spectra are presented. With the use of the high sensitivity photoacoustic spectrometer, the following values of the absorption coefficient were found: 2.3×10-9cm-1·Pa-1(λ=255 nm), 0.9×10-9 cm-1·Pa-1(λ=271 nm), and 1.6×10-9cm-1 ·Pa-1(λ=289 nm).
ATOMIC AND MOLECULAR PHYSICS

CORE POLARIZATION CORRECTIONS FOR THE PHOTOIONIZATION OF SODIUM

CHENG YAN-SONG, LIU JIN-CHAO, SUN WEI-GUO
Acta Phys. Sin. (Overseas Edition), 1998, 7 (3): 161-165 doi: 10.1088/1004-423X/7/3/002
Full Text: [PDF 144 KB] (Downloads:269)
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Many-body perturbation theory with an effective operator is applied to the calculations of photoionization of sodium by consistently including the static and dynamic core polarization. The cross section for the transition (2p→kd+ ks) is obtained by taking into account the dipole and quadrupole core polarization. The results are compared with the many-body perturbation results and measurements.

DYNAMIC SCREENING OF THE THREE-BODY COULOMB INTERACTIONS

CHEN ZHANG-JIN
Acta Phys. Sin. (Overseas Edition), 1998, 7 (3): 166-173 doi: 10.1088/1004-423X/7/3/003
Full Text: [PDF 187 KB] (Downloads:240)
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The BBK approach is modified by the introduction of effective Sommerf eld parameters for both symmetric and asymmetric geometries, according to the fact that the strength of any particular two body Coulomb interaction is affected by the presence of the third particle. The triple differential cross sections for electron impact ionization of atomic helium at incident energies of 40 and 50 eV in asymmetric geometry are calculated. Results of this approach are found to be in good agreement with the absolute measurements and the only existing theoretical results of the convergent close-coupling method.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

QUANTUM DIFFUSION IN TWO-DIMENSIONAL OCTAGONAL QUASICRYSTALS

YUAN HUI-QIU, ZHONG JIAN-XIN
Acta Phys. Sin. (Overseas Edition), 1998, 7 (3): 196-202 doi: 10.1088/1004-423X/7/3/007
Full Text: [PDF 208 KB] (Downloads:300)
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We have studied the quantum diffusion in an octagonal quasiperiodic tiling. Paticular attention is paid to the analysis of long-time behavior of the autocorrelation function C(t) and the relationship between diffusion and fractal dimensions of energy spectrum. For the pure hopping model, numerical calculations show that C(t)~t-1 , which corresponds to the case of periodic systems. For the combined model, in which the contribution of site potentials is considered, C(t)~t with 0<δ≤1. The scaling factor δ is related to Hamiltonian parameters and the type of site where electron is initially located. Moreover, we find a crossover from δ=1 to 0<δ<1 with increasing site potentials.

OPTICAL PROPERTIES OF ZnO COMPOSITE NANOPARTICLES

WANG RONG-YAO, WU XIAO-CHUN, WU PENG-FEI, ZOU BING-SUO, WANG LI, XU JING-ZHOU, XU JI-REN, WANG XIN-FENG, WANG ZHEN-JIA, CHEN JIAN-XIN
Acta Phys. Sin. (Overseas Edition), 1998, 7 (3): 203-208 doi: 10.1088/1004-423X/7/3/008
Full Text: [PDF 177 KB] (Downloads:288)
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We have synthesized core/shell structure ZnO composite nanoparticles by surface chemical modification. This new composite material shows a large optical gap redshift compared with the homogeneous ZnO nanoparticles. The visible photoluminescence ranging from blue to red in color with fast decay time may be as signed to the interfacial bound-exciton-like emission.

STUDY OF MICROSTRUCTURE AND ELECTROLUMINESCENCE OF ZINC SULFIDE THIN FILM

LIU ZHAO-HONG, WANG YU-JIANG, CHEN MOU-ZHI, CHEN ZHEN-XIANG, SUN SHU-NONG, HUANG MEI-CHUN
Acta Phys. Sin. (Overseas Edition), 1998, 7 (3): 209-113 doi: 10.1088/1004-423X/7/3/009
Full Text: [PDF 167 KB] (Downloads:373)
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The electroluminscent zinc sulfide thin film doped with erbium, fabri cated by thermal evaporation with two boats, are examined. The surface and internal electronic states of ZnS thin film are measured by means of X-ray diffracti on and X-ray photoemission spectroscopy. The information on the relations between electroluminescent characteristics and internal electronic states of the film is obtained. And the effects of the microstructure of thin film doped with rare earth erbium on electroluminescence are discussed as well.
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