Table of contents

20 April 1997, Volume 6 Issue 4 Previous issue    Next issue

GENERAL

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THERMAL PROPERTIES OF KERR-NEWMAN-DE SITTER XY BLACK HOLES XU DIAN-YAN (许殿彦), XU XIAO-FENG (许晓风) Acta Physica Sinica (Overseas Edition), 1997, 6 (4):  241-249.  DOI: 10.1088/1004-423X/6/4/001 Abstract ( 975 )   PDF (230KB) ( 350 )   Hawking radiation of scalar particles of Kerr-Newman-de Sitter XY (KNdSXY) black holes is studied by using complex analytical continuation (CAC) technique. We derive the surface gravity $\kappa$h, $\kappa$c and Hawking temperature Tb, Tc of the event horizons r+, r++. All of them are proportional to (|A|)1/2, where A is an indefinite multiple of KNdSXY metric.

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SURFACE GEOMETRY OF A UNIFORMLY ACCELERATING PARTICLE QIANG WEN-CHAO (强稳朝) Acta Physica Sinica (Overseas Edition), 1997, 6 (4):  250-256.  DOI: 10.1088/1004-423X/6/4/002 Abstract ( 966 )   PDF (209KB) ( 453 )   In this paper, analytic expressions of Gaussian curvature, Euler's characteristic and area of Schwarzschild surface for an accelerating particle are given. The effect of acceleration on the equatorial and polar circumferences is analyzed. The problem of embedding this surface into Euclidean 3-space is also examined.

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RENORMALIZATION GROUP APPROACH TO THE BOND PERCOLATION ON SIERPINSKI CARPETS LIN ZHEN-QUAN (林振权), YANG ZHAN-RU (杨展如), QIN YONG (秦勇) Acta Physica Sinica (Overseas Edition), 1997, 6 (4):  257-265.  DOI: 10.1088/1004-423X/6/4/003 Abstract ( 1132 )   PDF (240KB) ( 526 )   The critical behaviors of bond percolation on a family of Sierpinski carpets (SCs) are studied. We distinguish two sorts of bonds and assign them to two kinds of occupation probabilities. We develop the usual choice of cell on translationally invariant lattices and choose suitable cells to cover the fractal lattice. On this basis we construct a new real-space renormalization group (RG) transformation scheme and use it to solve the percolation problems. Phase transitions of percolation on such fractals with infinite order of ramification are found at non-trivial bond occupation probabilities. The percolation threshold values, correlation length exponents $\nu$, and the RG flow diagrams are obtained. The flow diagrams are remarkably similar to those of Ising model and Potts model. This agrees with the correspondence between the pure bond percolation and Potts model.

ATOMIC AND MOLECULAR PHYSICS

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THE PHASE CHARACTER OF ZEEMAN MODULATION MAGNETIC ROTATION LASER SPECTROSCOPY CHEN JIN-HAI (陈金海), CHEN YANG-QIN (陈杨), CAI PEI-PEI (蔡佩佩), XIA CHANG-PING (夏长平), WANG ZU-GENG (王祖赓) Acta Physica Sinica (Overseas Edition), 1997, 6 (4):  266-274.  DOI: 10.1088/1004-423X/6/4/004 Abstract ( 1029 )   PDF (280KB) ( 347 )   Zeeman modulation-magnetic rotation spectroscopic (ZM-MRS) technique is provided with not only high sensitivity and high signal-to-noise ratio, but also apparent phase character for studying molecular spectrum. It is quite helpful for assigning some complex molecular rotational spectra. As an example, the ZM-MRS spectra of NO2 molecule was measured in the region between 16838cm-1 and 16860cm-1 with high resolution. The semi-classical magnetic rotation theory was used to explain the spectral feature and its phase relation with transition quantum number. It is in agreement with the experimental results. Finally, by using matrix diagonalization of effective Hamiltonian, the ZM-MRS spectra of NO2 molecule were analyzed and a reasonable assignment was obtained.

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THEORETICAL RESEARCH ON OPTICAL,THERMAL AND MAGNETIC PROPERTIES OF DICHLOROTETRAPY-RAZOLENICKEL(TYPE II)COMPLEX YAN ZHAN-XIAN (颜占先), ZHOU XIAO-QING (周小清), DAI WEI (戴薇) Acta Physica Sinica (Overseas Edition), 1997, 6 (4):  275-282.  DOI: 10.1088/1004-423X/6/4/005 Abstract ( 1081 )   PDF (240KB) ( 385 )   In this paper, we have calculated and analyzed theoretically and consistently the absorption spectra, the ZFS and EPR parameters of the ground state, the Schottky low-temperature heat capacity, and the paramagnetic susceptibility of Ni(pz)4Cl2 (Dichlorotetrapyrazolenickel) complex by using d8[(1-C2)D*4h+C2D*2h] complete configuration mixing unified crystal field theory. The theoretical results agree with the experimental observation very well. We can give a complete and reasonable theoretical interpretation of the optical, thermal and magnetic properties of Ni(pz)4Cl2.

CLASSICAL AREAS OF PHENOMENOLOGY

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GENERATION OF ENTANGLED FOCK STATES OF TWO NONLOCAL CAVITY MODES WITH DIFFERENT FREQUENCIES GUO GUANG-CAN (郭光灿), ZHENG SHI-BIAO (郑仕标) Acta Physica Sinica (Overseas Edition), 1997, 6 (4):  283-287.  DOI: 10.1088/1004-423X/6/4/006 Abstract ( 1046 )   PDF (181KB) ( 522 )   We present a method to generate entangled Fock states of two nonlocal cavity modes with different frequencies. We send an atom with three levels g, e, and f across two cavities. The atomic transition frequency between level g and e is resonant with the first cavity frequency, while the atomic transition frequency between level g and f is resonant with the second cavity frequency. The detection of the atomic state leaves the pure field in an entangled Fock state.

PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES

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THE DISTRIBUTION OF THE SCATTERED LASER LIGHT IN LASER-PLATE-TARGET COUPLING NIE XIAO-BO (聂小波), CHANG TIE-QIANG (常铁强), LAI DONG-XIAN (赖东显), LIU SHEN-YE (刘慎业), ZHENG ZHI-JIAN (郑志坚) Acta Physica Sinica (Overseas Edition), 1997, 6 (4):  288-294.  DOI: 10.1088/1004-423X/6/4/007 Abstract ( 1152 )   PDF (228KB) ( 386 )   Theoretical and experimental studies of the angular distributions of scattered laser light in laser-Au-plate-target coupling are reported. A simple model that describes three-dimensional plasmas and scattered laser light is presented. The approximate shape of critical density surface has been given and the three-dimensional laser ray tracing is applied in the model. The theoretical results of the model are consistent with the experimental data for the scattered laser light in the polar angle range of 25$^\circ$ to 145$^\circ$ from the laser beam.

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ELECTRON CYCLOTRON CURRENT START-UP FOR OHMIC DISCHARGE ON CT-6B TOKAMAK FENG CHUN-HUA (冯春华), YAO XIN-ZI (姚鑫兹), JIANG DI-MING (蒋地明), QI XIA-ZHI (戚霞枝), JIANG DE-YI (江德仪), LI ZAN-LIANG (李赞良), WANG LONG (王龙), ZHENG SHAO-BAI (郑少白) Acta Physica Sinica (Overseas Edition), 1997, 6 (4):  295-301.  DOI: 10.1088/1004-423X/6/4/008 Abstract ( 1224 )   PDF (226KB) ( 740 )   Electron cyclotron current start-up as a scheme to initiate ohmic discharges has been investigated with two circuits of open and shorted primary windings of transformer. The experimental results indicate that we can achieve the saving of equivalent flux and the reduction of starting voltage in the initial phase for the two circuits in fundamental frequency resonance region.

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

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DIELECTRIC AND PYROELECTRIC CHARACTERISTICS AND FERROELECTRIC SOFT MODES IN PbTiO3 POLYCRYSTALS DOPED WITH Ca2+ ZOU QIN (邹秦), GUO A-QIANG (郭阿强), MENG ZHONG-YAN (孟中岩) Acta Physica Sinica (Overseas Edition), 1997, 6 (4):  302-309.  DOI: 10.1088/1004-423X/6/4/009 Abstract ( 907 )   PDF (249KB) ( 407 )   The effects of Ca2+ ions on the structure and dielectric and pyroelectric characteristics of PbTiO3 polycrystals were investigated. With increasing content of Ca, a decrease in tetragonal axial ratio (c/a) was observed as a consequence of shrinkage of the lattice parameter c. The dielectric constant and pyroelectric coefficient increase and Curie temperature (TC) shifts toward lower temperature with increasing content of Ca. The theory of ferroelectric soft mode has been developed to illuminate the relationship between the structure and properties of the polycrystal.