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Volume 6 Issue 8
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Original Articles
IMPROVED CALCULATION OF HADRONIC VACUUM POLARIZATION CORRECTIONS TO PHOTON PROPAGATOR
A.Karimkhodzhaev, ZHENG Xite
Chin. Phys. Lett. 1989, 6 (8): 337-338 .  
Abstract   PDF(pc) (28KB) ( 517 )
The hadronic vacuum polarization correction to the photon propagator is found by wing the Dubnicka-Meshcheryakov parametrization of the pion form factor and new experimental data on the e+e-→ hadrons annihilation cross section.
NUCLEAR BINDING EFFECTS ON DRELL-YAN PAIR PRODUCTION
SHEN Jianguo, QIU Xijun
Chin. Phys. Lett. 1989, 6 (8): 339-342 .  
Abstract   PDF(pc) (49KB) ( 500 )
The production of high mass dimuon for π- W was calculated in the frame-work of the dual model. The ratio of DY cross sections on two different nuclear targets is close to that of DIS cross sections in the kinetic range of the NA10 experiment.
ROOM TEMPERATURE D-D FUSION REACTION RATE -A STRONG-COUPLING PLASMA MODEL
YAN Xinzhong*, TSAI shidong, GUO shichong, ZHANG Zhaoqing
Chin. Phys. Lett. 1989, 6 (8): 343-346 .  
Abstract   PDF(pc) (51KB) ( 731 )
A strong-coupling plasma model with ion screening and electron polarization was used to study the room temperature D-D fusion reaction rate. By using the ground state harmonic-oscillator wave function, we evaluated the nearest-neighbor penetration probability by WKB method. The D-D nuclear fusion reaction rate was calculated. The deuteron density is found to be crucial for the occurrence of fusion reaction while the temperature is much less important.
VIBRATIONAL PREDISSOCIATION OF MOLECULAR CLUSTERS IN THE PRESENCE OF A STRONG RADIATION
XIANG Tianxiang
Chin. Phys. Lett. 1989, 6 (8): 347-350 .  
Abstract   PDF(pc) (50KB) ( 364 )
Vibrational predissociation (VP) of molecular clusters in a strong laser field was studied using semiclassical theory and dressed molecular approach. Numerical calculation indicates that VP transition rates are greatly enhanced in the presence of a strong laser field. This effect is especially remarkable when the laser frequency meets the near resonant condition. The result is discussed in terms of Franck-Condon type overlap integral.
NEW TREATMENT OF QUANTUM REVIVALS
HUANG Xiangyou*, PENG Jinsheng
Chin. Phys. Lett. 1989, 6 (8): 351-354 .  
Abstract   PDF(pc) (43KB) ( 469 )
When a real system consisting of a two-level atom and a single-mode field is described by a pair of state vectors, the energy of the atom shows a stationary cosine oscillation. When this energy is averaged over an ensemble, we get the usual periodic decays and revivals of the mean value of the energy.
CRYSTAL GROWTH AND FUNDAMENTAL PROPERTIES OF Cdx(Sr0.61Ba0.39)1-xNb2O6
SONG Yongyuan, CHEN Huanchu, SUN Daliang, ZHANG Peilin*, ZHONG Weilie*
Chin. Phys. Lett. 1989, 6 (8): 355-358 .  
Abstract   PDF(pc) (50KB) ( 311 )
Cdx(Sr0.61Ba0.39)1-xNb2O6 (CdSBN) crystals have been grown successfully by Czochralski technique. The difficulty in crystal growth increased with the increase of the crystal diameter. Macroscopic defects, such as striations and crackings were observed in some crystals. Temperature dependence of dielectric constant ε`γ3 and pyroelectric coefficient P were studied. The relationship between grown behavior and melt compositions was also discussed.


A NEW ICOSAHEDRAL QUASICRYSTAL IN A DUPLEX STAINLESS STEEL
HU Zhengwei, XU Shunsheng(S.S.Hsu), ZHU Jian, JIANG Xiaolong
Chin. Phys. Lett. 1989, 6 (8): 359-362 .  
Abstract   PDF(pc) (106KB) ( 322 )
A new icosahedral phase has been found in a duplex stainless steel, which is formed in the α-grains by precipitation in the process of conventional ageing at 500°C. The icosahedral grains are strongly oriented with the α-matrix grains.
PARENT PHASE(B2)-INCOMMENSURATE PHASE(1C) TRANSITION IN NiTi(Fe) ALLOY
WANG Weizhong, QIAN Hua, WANG Zixiao
Chin. Phys. Lett. 1989, 6 (8): 363-365 .  
Abstract   PDF(pc) (36KB) ( 389 )
Parent phase(B2)-incommensurate phase(IC) transition in NiTi(Fe) a11oy is dealed with Landau theory. The order parameters are the complex amplitudes of the charge density waves(CDWs). Thu transition is a weakly first order one. The point symmetry of IC is 31m.
ADSORBATE-INDUCED RECONSTRUCTIONS OF Mo(001) SURFACE
ZI Jian, ZHANG Kaiming, XIE Xide
Chin. Phys. Lett. 1989, 6 (8): 366-369 .  
Abstract   PDF(pc) (56KB) ( 691 )
The monolayer adsorbed Mo(001) surface is studied by the slab dynamical calculation by wing the nearest and next nearest neighbour interactions. The phase diagram is obtained for light, heavy atom adsorbed and clean Mo(001) surface. The surface reconstruction induced by the interactions between adsorbed atoms is dicussed.
ELECTRON CORRELATION AND MANY-BODY WAVE FUNCTION OF SEMICONDUCTOR HETEROJUNCTION
WANG Hongwei, FENG Weiguo, MAO Huiming, SUN Xin
Chin. Phys. Lett. 1989, 6 (8): 370-373 .  
Abstract   PDF(pc) (55KB) ( 470 )
Based on the Correlated-Basis-Functions (CBF) theory, we have obtained the many-body wave function for the quasi-two-dimensional electron system in A1xGa1-xAs-GaAs heterojunction. The pair-correlation functions g(R) were calculated, and a new method for the calculation of correlation energy was also presented.
MAGNETIC STUDIES OF AMORPHOUS Fe90-xVxZr10 ALLOYS
CHEN Jinchang, LI Zhiqiang, SHEN Baogen, ZHAO Jiangao, TONG Zexin
Chin. Phys. Lett. 1989, 6 (8): 374-376 .  
Abstract   PDF(pc) (43KB) ( 294 )
The influence of substituting V for Fe on the magnetic properties of amorphous Fe90-xVxZr10 alloys have been systematically investigated. A clear maxium in Curie temperature, a decrease of high-field susceptibility and magnetic moment with addition of V was observed.
THE GROWTH OF e-BEAM EVAPORATED POLYCRYSTALLINE NICKEL FILM
ZHENG Tianshui, SHEN Yuanhua, WANG Wencheng, ZHANG Zhiming, WANG Zhijiang*
Chin. Phys. Lett. 1989, 6 (8): 377-380 .  
Abstract   PDF(pc) (122KB) ( 540 )
The growth of nickel polycrystals in the e-beam evaporated Ni film was studied by electron diffraction and TEM image. The in-situ resistance measurements of Ni film deposited on different substrates show the minimum thickness to form a continuous Ni superficial layer.
A NEW METHOD TO MEASURE THE ADSORBATE COVERAGE: TIME-DEVELOPED ION SCATTERING SPECTROSCOPY (TDISS)
LI Yongxue, ZHAI Runsheng, GUO Xiexian
Chin. Phys. Lett. 1989, 6 (8): 381-384 .  
Abstract   PDF(pc) (56KB) ( 364 )
TDISS has been applied in investigating the change an coverage with time of exposure of several gases adsorbed on Rh(111) at room temperature. When the energy of the incident He+ ions is of 100eV range, the disturbance of incoming ions is depressed to a negligible level. Satisfactory adsorption isotherms can be easily measured for all gases other than hydrogen.
13 articles