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Volume 9 Issue 3
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Original Articles
Gravitational Field of a Rotating, Arbitrarily Accelerating Mass
JING Jiliang, YU Hongwei, WANG Yongjiu
Chin. Phys. Lett. 1992, 9 (3): 113-116 .  
Abstract   PDF(pc) (137KB) ( 466 )
A new metric depending on five arbitrary parameters is obtained by the method of complex coordinate transformations. It gives the gravitational field of a mass source with both arbitrary acceleration and rotation.
Electrically Charged Torque Pendulum Experiment with a Null Result
LI Jianguo, FAN Shuhua, ZHANG Xuerong, LUO Jun
Chin. Phys. Lett. 1992, 9 (3): 117-119 .  
Abstract   PDF(pc) (171KB) ( 407 )
We repeated Saxl's electrically charged pendulum experiment with an accuracy about one order higher. We found no anomalous period change reported by him. Further experiment research shows that his result could be explained if there were the affection of a capacitance between the pendulum disk and other part of the apparatus in his experiment.
Diffusion-Limited Aggregation of Dimers
CAO Qunsheng*, PENG Gongwen**, TIAN Decheng***
Chin. Phys. Lett. 1992, 9 (3): 120-122 .  
Abstract   PDF(pc) (144KB) ( 447 )
We have simulated the diffusion-limited growth of dimers on a two-dimensional triangluar lattice and have found that if tips of the dirners have different polarities, the resulting clusters, due to the alignment of the dimers and polarities chosen, are Jess dense than the clusters generated without polarities. These results make our model an effective way to demonstrate the role of the sticking probabilities in the diffusion-limited aggregation.

The Cranking Shell Model Analysis for the Yrast Band of 87Nb
LUO Wendong, CHEN Yongshou+
Chin. Phys. Lett. 1992, 9 (3): 123-126 .  
Abstract   PDF(pc) (221KB) ( 418 )
The back bending phenomenon observed in 87Nb is interpreted very well within the approach of the triaxial cranking shell model (CSM) with the deformations determined by a total routhian surface calculation which includes the deformation drive of the high j quasiparticle orbits. It is suggested that the CSM is still valid for slightly deformed transitional nuclei if the configuration dependence of deformations is taken into account properly.

On the Stopping Power in High Energy Nucleus-Nucleus Collision and Number of Effective Energy Sources
LIU Yingzhuang, CAI Xu, LIU Lianshou
Chin. Phys. Lett. 1992, 9 (3): 127-129 .  
Abstract   PDF(pc) (167KB) ( 526 )
Based on the multisource model, the number of effective energy sources and the average impact parameter in central nucleus-nucleus collisions are estimated through fitting the experimental data. The dependence of stopping power on incident energy and target nucleus is discussed.

Theoretical Study to Identify the Amplified Spontaneous Emissions in NF and FO
XIE Fangqing, LIU Lei+, XIA Yuxing, LI Jianiing+
Chin. Phys. Lett. 1992, 9 (3): 130-132 .  
Abstract   PDF(pc) (159KB) ( 481 )
We present our theoretical study to identify two new amplified spontaneous emissions (241.3 and 268.7nm) in the NF and FO molecules. We also present our theoretical calculations for electronic structures of molecular Rydberg excited states for the NF and FO molecules.

Electronic Structure of Molecular Rydberg States
YANG Huanwang+, SUN Biao, LI Jiaming
Chin. Phys. Lett. 1992, 9 (3): 133-136 .  
Abstract   PDF(pc) (259KB) ( 338 )
Comprehensive theoretical results of the molecular Rydberg structures with the total-electron numbers starting from 2 to 18 are reported. We attempt to elucidate: (1) systematic trends of the variation of the eigen quantum defects among those molecules, (2) characteristics of the molecular dynamics between
the excited electron and the corresponding molecular ions.

Self-pumped Phase Conjugation of Co-Doped (KNa)0.1( Sr0.75Ba0.25)0.9Nb2O6 Crystal
SUN Daliang, CHEN Huanchu, JIANG Quanzhong, CHEN Jun, ZHANG Zhiguo*, YANG Changxi*
Chin. Phys. Lett. 1992, 9 (3): 137-139 .  
Abstract   PDF(pc) (173KB) ( 360 )
Self-pumped phase conjugate in trapezoid-cut Co-doped (KNa)0.1( Sr0.75Ba0.25)0.9Nb2O6 (Co-KNSBN) crystal was demonstrated without external reflection mirrors and applied field, phase conjugation reflectivities as high as 40.5% were measured. The threshold power was lower than 0.02 W/cm2. The device was operated in one-region four-wave mixing using the photorefractive effect.

Propagation Features of the Single-Mode Taper Fiber
Chin. Phys. Lett. 1992, 9 (3): 140-143 .  
Abstract   PDF(pc) (139KB) ( 889 )
For weakly-waveguide, using contraction transformation, a scalar wave equation with an axial direction variable z is established to describe a single-mode taper fiber. Gaussian function is used to approximate the fundamental mode of field in the taper fiber. The local field and the local propagation constant expressions are given.

Characteristics of the Plasma During Chemical Vapor Deposition for Diamond Growth
GAO Kelin*, ZHAN Rujuan, WANG Chunlin, CAO Jinxiang, XIANG Zhilin
Chin. Phys. Lett. 1992, 9 (3): 144-147 .  
Abstract   PDF(pc) (208KB) ( 565 )
During the course of diamond growth by dc plasma chemical vapor deposition and microwave plasma chemical vapor deposition, characteristics of the plasma were measured by Langmuir single probe, double probe, emission spectrometer and microwave interferometer. The relationships between plasma parameters and the concentration of hydrocarbon, the power, pressure and the gas flow rate are discussed.

Growth and High Reflectivity Self-pumped Phase Conjugate of Cu-Doped KNSBN Crystal
SUN Daliang, SONG Yongyuan, JIANG Quanzhong, CIIEN Huanchu, XU Jingjun*, WU Yuanqing*, LIU Simin*, ZHANG Guangyin*
Chin. Phys. Lett. 1992, 9 (3): 148-150 .  
Abstract   PDF(pc) (172KB) ( 498 )
The Cu-doped KNSBN crystals have been grown. The self-pumped phase conjugate mirrors of Cu-doped KNSBN crystals have been demonstrated. The phase conjugate reflectivity reaches as high as 68% for the crystal with 0.04 wt.% Cu-doped. The phase conjugate reflectivity and its response time were also measured as a function of the argon-ion laser wavelengths.

Soliton and Soliton-Pair as the Intrinsic Phonon Localized Modes in an Anharmonic Monoatomic Chain
HUANG Guoxiang, LI Hongfang, DAI Xianxi
Chin. Phys. Lett. 1992, 9 (3): 151-154 .  
Abstract   PDF(pc) (178KB) ( 428 )
With the use of coherent-state method, a quantum approach for the intrinsic phonon localized modes in an anharmonic monoatomic chain is given. It is shown that the envelope soliton with zerogroup velocity can exist in the lattice and that the frequency of carrier wave is above the top of the frequency band. A new type of the intrinsic phonon localized mode which we call the soliton-pair intrinsic localized mode in the chain is also reported.
Superconducting State Volume in High Tc Superconductor and Non-resonant Microwave Absorption
HOU Bihui, WANG Zhizhong
Chin. Phys. Lett. 1992, 9 (3): 155-158 .  
Abstract   PDF(pc) (168KB) ( 468 )
The mechanism of low-field non-resonan microwave absorption is speculated, and it is exposed that the magnitude of the microwave signal indicates the su-perconducting state volume in the shell lying along inner surface of the sample.
Hole Concentration Dependence of Tc in Bi2Sr2CaCu2Oy System
FANG Minghu, XU Zhuan, WEI Hongbin, ZENG Xingbin, HU Gangjin, ZHANG Xuanjia, ZHANG Qirui, WU Yuming*, WANG Qidong*, SHA Jian**, CAO Liezhao**
Chin. Phys. Lett. 1992, 9 (3): 159-161 .  
Abstract   PDF(pc) (158KB) ( 592 )
The resistance, ac susceptibility and Hall coefficient measurements were carried out for the high quality single phase Bi2Sr2CaCu2Oy samples with different oxygen contents. It is found that the number of extra oxygen atoms in the samples can be easily modulated when they are annealed in low vacuum, and that the relationship between Tc and P+ is unmonotonic with an optimum P+ =0.27holes/CuO2 plane corresponding to the highest Tc(=95 K). This unmonotonic relationship is discussed briefly.

Black Holes with Intrinsic Spin
ZHAO Zheng
Chin. Phys. Lett. 1992, 9 (3): 162-164 .  
Abstract   PDF(pc) (128KB) ( 510 )
There exists a sort of stationary axisymmetric non-Kerr black holes with in-trinsic spin. Their angular velocity is zero, but angular momentum is not zero. There are dragging effects and ergosphere in this sort of space-times.
Hydrodynamics for Molecular Cloud Under Strong Perturbation
MAO Xinjie, MAO Xinguo*
Chin. Phys. Lett. 1992, 9 (3): 165-168 .  
Abstract   PDF(pc) (167KB) ( 394 )
The dynamics of a molecular cloud affected by strong perturbation is a nonlin-ear problem. We deal with a simplified case, and have analytically solved the nonlinear equations and obtained solutions in the form of travelling wave. Fur-ther we have discussed a case involving magnetic field. The solutions explain the behavior of a molecular cloud encountering a collision and the impact of the strong perturbation on forming a young star.
16 articles