bluuebunny/crossref_metadata_2025 huggingface dataset:
GROUND STATE STUDY OF SPIN S = 1 ISING ANTIFER-ROMAGNETIC MODEL ON FACE-CENTRED CUBIC LATTICE
Authors: XU GUO-LIANG  , WANG YANG-PU  ,   苏州大学物理系,苏州215006
Published: November 2020

This paper develops the method presented in reference (1) where the Fermion transformation is used to obtain the ground state of the Ising model. According to that after the Ferrnion transformation, the phase boundary can be obtain using the condition that energy of excited state is greater than zero, we propose that phase boundary can be obtain by directly comparing the energy of the vacuum state. Using this method, we study the most general spin S=1 Ising antifer-romagnetic model with nearest neighbor interaction, and obtain rigorously the ground state energy and the OK phase diagram of the model on fcc lattice. Meanwhile, using equation of many phase point, we divide the plane of parameter k,l into 56 regions, which correspond to topologi-cally distinct OK phase diagrams.
EFFECT OF COMPOSITION AND TRANSITION METALS ON CRYSTALLIZATION TEMPERATURE OF Fe-Zr-BASED AMORPHOUS ALLOYS
Authors: SHEN BAO-GEN  , WO FENG  , YANG LIN-YUAN  , ZHAO JIAN-GAO  , GUO HUI-QUN  , ZHAN WEN-SHAN  , CHEN JIN-CHANG  ,   (1)北京师范学院物理系,北京100037; (2)中国科学院物理研究所,北京100080
Published: November 2020

The composition dependence of the crystallization temperature Tcr for Fe100-xZrx,(Fe1-xZrx)84B16 and Fe90-xMxZr10(M = V,Cr,Mn,Co,Ni,Si,B) amorphous alloys is investigated systematically. The main results are: the substitution of Zrfor some Fe in Fe-based amorphous alloysTcr exhibits an increase markedly; for amorphous Fe90-xMxZr10 alloys, Tcr increases following the order M = Mn, Cr, V and with increasing M content x, and decreases following the order M = Co, Ni and with increasing x; in most of the samples studied, the ratio of crystallization temperature to melting point is about 2/3; when the alloy composition was varied ( <20at%-M) or an alloying transition element was added, Tcr increased linearly with decreasing average number outer electrons per atom which was calculaied by taking into account both the s,p and d electrons of the transition metal atoms. These results are discussed in connection with various factors such as composition, phase diagram, melting point, interatomic force and e/a effecting the stability of amorphous alloys.
REENTRANT BEHAVIOUR OF SPIN GLASS AND THE MAGNETIC PHASE DIAGRAM OF A SPINEL SYSTEM CoxZn1-x(Fey-Cr1-y)2O4
Authors: ZHOU WEN-SHENG  , BIAN YAN  ,   北京大学物理系,北京100871
Published: November 2020

A study of magnetic properties in the insuluing spinel system CoxZn1-x(FeyCr1-x2O4 has been made based on the temperature relationships of the low-frequency, weak field ac susceptibilities and low field magnetizations measurements. According to the above experimental results, we propose a probable magnetic phase diagram of the spinel. This magnetic phase diagram shows the reentrant spin glass phenomena in quite wide concentration ranges in the spinel. Increasing the concentration of the magnetic ions, the freezing temperatures of the reentrant spin glass increase. These properties are common in the systems with a few kinds of the magnetic ions or the magnetic ions which concentration are quite high. The mechanism of reentrance of spin glasses has been discussed in the paper. The reentrant spin glass in the spinel is a mixed state of spin glass and ferrimagnetic microdomains or spin clusters, which come from the collapse of the ferrimagnetic state.
SUPERCONDUCTING FLUCTUATION AND PARACONDUCTIV-ITY IN AMORPHOUS ZrCo ALLOYS
Authors: LI YAN-FEI  ,   哈尔滨科学技术大学技术物理系,哈尔滨,150080
Published: November 2020

The electrical resistance and low-field magnetoresistance have been measured on three dimensional ZrCo alloys. The data of magnetoresistance can be accounted for by the contributions from the quenching of superconducting fluctuation and weak localization. The former described by the Maki-Thompson correction is predominant at lower temperatures. The interaction in the particleparticle channel gives rise to a negative magnetoresistance.The paraconductivity phenomenon has been observed and found to be in good agreement with the theory, the (M-T) term plays an important role, the depression by the pair breaking effects due to thermal phonons may only be 10% of the term.
THE ANOMALOUS DIFFRACTION OF A LASER BEAM IN LiNbO3:Fe CRYSTAL (Ⅱ)——o→e DIFFRACTION
Authors: LIAO LI-JI  , CHEN WEI-QUN  , LIU YAN  , JIANG YI-JIAN  , ZHANG PENG-XIANG  , LIU YU-LONG  ,   (1)北京工业大学应用物理系,北京100022; (2)中国科学院物理研究所,北京100080
Published: November 2020

Some experimental facts concerning the anomalous diffraction pattern which arises when a laser beam o ray passes through a LiNbO3: Fe crystal with diffracted e ray and related phenomena in the Raman spectra are described. And the same method as was used in ref. [1] is applied to calculate the diffraction pattern quantitatively. Result of the calculations fits the experiment fairly well, this manifests the applicability of the theory of anisotropic diffraction of volume phase gratings to the anomalous diffraction with a 90° rotation of the polarization of the beams. Many other experimental facts are interpreted as well.
EXPERIMENTAL VERIFICATION OF THE 11.528MeV STATE IN 24Mg
Authors: SHI DE-TANG  , GUO ZHEN-DI  , YANG FU-JIA  ,   (1)上海复旦大学原子核科学系; (2)中国高等科学技术中心(世界实验室)
Published: November 2020

This work gives the experimental verification about the existence of the 11.528 MeV state in 24Mg which was newly discovered with the recoil-coincident technique in HI reaction. Resonant γ-ray absorption method has been used. Several dips have been observed in the resonance absorption transmission curve and recognized to be the fine structure around the 11.528 MeV excited energy level. The excitation energy and level width were deduced for each sub-level and the total width of energy level 13.321 MeV in emitting nucleus 28Si was also obtained from data fitting procedures.
STRONG RADIAL-RADIAL CORRELATION REGION IN DOUBLY EXCITED 1Se STATES OF HELIUM ATOM
Authors: BAO CHENG-GUANG  ,   中山大学物理系
Published: November 2020

The electron-electron correlation in the N=3 series of the 1Se helium states has been investigated in detail. The geometric implication of the K-classification scheme has been recognized. The strong radial-radial correlation region where the radial motions of the two electrons are, coupled strongly in inverse phase has been discovered.
THE STABILITY OF NON-SINGULAR SPHERICAL BLACK HOLE
Authors: YU YUN-QIANG  , FAN ZU-HUI  ,   (1)北京大学物理系,北京,100871; (2)北京大学物理系,北京,100871,中国科学院理论物理研究所,北京,100080
Published: November 2020

The dynamics of non-singular spherical black hole suggested by Gonzalez-Diaz is investigated. We show that it's matter configuration is in peculiar equilibrium and unstable. It's formation is seldom and it is liaule to transit to a normal black hole.
HIGH-FIELD MAGNETIZATION PROCESS OF Ho2Fe14B COMPOUND
Authors: ZHAO TIE-SONG  , JIN HAN-MIN  ,   吉林大学物理系,长春,130023
Published: November 2020

The magnetization processes of the Ho and Fe sublattices in Ho2Fe14 compound along the [100] , [110] and [001] axes at 0 K are analysed in detail by the calculation based on the single-ion model. The high-field magnetization processes of Ho2Fe14 at 0 K along the principal crystal axes in a field up to 2000 kOe are predicted by the calculation.
ST RUCTURAL AND MAGNETIC PROPERTIES OF TERNARY NEODYMIUM-IRON-CARBON (OR CARBON-BORON) COMPOUNDS
Authors: XING FENG  , HE WEN-WANG  ,   北京大学物理系,北京,100871
Published: November 2020

Crystallographic and magnetic properties of the Nd14Fe78B8-xCx compounds were investigated. The properly annealing treatment was found to be the condition that the compounds of light rare earth-iron-carbon belonging to the P42/mnm type structure could be formed. The magnetic ordering temperatures of the compounds decreased somewhat with increasing the carbon concentration, but the saturation magnetization σs had a gentle maximum, and the residual ma gnetization σr, intrinsic coercivity iHe as well as the anisotropy field Ha at room temperature showed a significant increase. The anisotropy behaviours of the C-containing samples were similar to Nd-Fe-B. The fact that the transition temperatures of spin reorientation gradually descended with increasing the carbon content while the canting angle at 1.5 K had a slight increase suggested that there was complicate coupling between the anisotropies of Nd and Fe sublattices. In addition, the suitably Nd-rich carbide exhibited relatively large anisotropy.
ANGLE-RESOLVED UPS INVESTIGATION OF COADSORPITON OF CO AND K ON Fe(110) SURFACE
Authors: BAO SHI-NING  , ZHU LI  , XU YA-BO  , LI ZHUO-ZHI  ,   浙江大学物理系,杭州,310027
Published: November 2020

A symmetry plane for K-CO coadsorbate at low coverage on Fe(1lO) surface was foundusing angle-resolved UPS with polarized light. This plane is parallel to the azimuth ofthe crystal surface. The dependence of the CO 4σ peak intensity on incidence angle was foundto be nearly the same as in the case without K, where the molecular axis of CO is perpendicular to the surface.
INFLUENCE OF ADDING KCl ON LIGHT ABSORPTION SPECTRA OF SILVER COLLOID
Authors: WANG WEI-NING  , FANG YAN  , FU SHI-YOU  , ZHANG PENG-XIANG  ,   (1)北京师范学院物理系; (2)中国科学院物理研究所,北京,100080
Published: November 2020

The influence of adding KCI to silver colloid on light absorption of the colloid was studied and compared with that of adding pyridine to the colloid. It was found that the light absorption was increased due to the formation of an atomic cluster layer on the Ag particle surfaces caused by adding KCI, and that the original surfaces plasmon resonance absorption was reduced. At the same time, the linear-chain aggregation caused by adding KCI lead to an apparent red shift of the plasmon resonance absorption, which sometimes was difficult to observe. The influence of these changes on SERS was also discussed.
HIGH POWER SUM FREQUENCY GENERATION OF 230.8—223.2nm IN BBO CRYSTAL
Authors: LU SHI-PING  , YUAN YI-QIAN  , YANG LI-SHU  , WU CUN-KAI  ,   中国科学院安徽光学精密机械研究所,合肥,230031
Published: November 2020

Continuously tunable second harmonic generation of 294.8-282.5 nm was obtained by Q-switched YAG laser pumped Rh·6G dye laser in a 45°cut β-BaB2O4 (BBO) crystal. The output energy of the harmonic wave is about 8mJ around 285 nm. The continuously tunable output over the range of 230.8-223.2 nm was also obtained by the sum frequency mixing between the residual pump fundamental wave (1064nm) and the second harmonic wave of Rh 6G dye laser in an other 45°cut BBO crystal. The sum frequency output energy is about 120 μJ around 226 nm, the corresponding peak power is 12 kW. The key techniques of the sura frequency generation were indicated.
RHEED INTENSITY OSCILLATIONS IN THE PROCESS OF MOLECULAR BEAM EPITAXY GROWTH OF Ge AND Si ON Si SUBSTRATES
Authors: CHEN KE-MING  , JIN GAO-LONG  , SHENG CHI  , ZHOU GAO-LIANG  , JIANO WEI-DONG  , ZHANG XIANG-JIU  , YU MING-REN  ,   复旦大学表面物理实验室,上海,200433
Published: November 2020

RHEED intensity oscillations in the process of MBE growth of Ge and Si on Si (100) and Si (111) substrates were observed. It is revealed that a finite-thick buffer layer can improve the surface flatness of Si substrates, and the employment of lower growth rate or growth interruption procedure can improve tke crystal quality of epilayers. During the growth of Ge and Si on Si (100), a single atomic layer mode RHEED intensity oscillation was observed along either [100] or [110] azimuthal direction, which is due to the existance of double domain (2×1)+(1×2) reconstruction on the surface. During the growth of Ge on Si (111) substrates, RHEED intensity oscillation show a bilayer mode observed along [112] azimuth, but a non-uniform periodicity along [110] azimuth. The oscillations for continuosly growing Ge-on either Si (100) or Si (111) could exist up to an epilayer thickness of 6ML, which corresponds to the critical thickness of pseudomorphic growth of Ge on Si.
SUPPRESSION AND ELIMINATION OF SECONDARY DEFECTS IN SILICON IMPLANTED WITH MeV ENERGETIC B+ IONS
Authors: LU WU-XING  , QIAN YA-HONG  , TIAN REN-HE  , WANG ZHONG-LIE  ,   北京师范大学低能核物理研究所,北京,100875
Published: November 2020

Thermal annealing behavior of secondary defects in silicon implanted with MeV energetic boron ions has been studied. We snggest a new type of enhanced annealing effect of donble implantation, which can be used effectively to suppress or eliminate the secondary defects in such implanted silicon samples. The physical mechanism of the suppression and elimination processes is discussed.
ELECTRONIC BOUND STATES OF CHARGED SOLITON
Authors: LU DING-WEI  , SUN XIN  , FU ROU-LI  , LIU JIE  ,   (1)四川理论物理中心,四川师范大学,成都,610068; (2)中国科学院理论物理研究所,北京,100080,复旦大学物理系,上海,200433,南京市南京低温气体公司; (3)中国科学院理论物理研究所,北京,100080复旦大学物理系,上海,200433; (4)中国科学院上海技术物理研究所红外物理开放研究实验室,上海,200083
Published: November 2020

The existing theory points out that the soliton in polyacetylene only possess one electronic bound state-the mid gap state. Our work shows that, due to the electron interaction and the discrete atomic structure of polymer chain, the charged solitons have two bound states in the gap; one is a deep level, which is 0.2eV away from the midpoint of the gap; the other is a shallow level 0.06eV apart from the band edges. Our theory agrees with the photo-induced absorption in trans-(CH)x.
FORMATION AND STATIC CHARACTERISTICS OF THREE KINDS OF HARD DOMAINS IN BUBBLE MATERIALS
Authors: NIE XIANG-FU  , TANG GUI-DE  , NIU XIOU-DE  , HAN BAO-SHAN  ,   (1)河北师范大学物理系,石家庄,050016; (2)上海交通大学物理系,上海,200030; (3)中国科学院物理研究所,北京,100080
Published: November 2020

The criterion of classification for three kinds of hard domains with lots of VBLS in their walls in garnet bubble materials is proposed. Their formation and static characteristics are described in detail and their typical pictures are shown. Considering the formation conditions of hard domains, it is reasonable to deduce that the increase of the number of VBLs in their walls leads to substantial change of their static characteristics.
POWER BROADENING OF PHOTOEMISSION SPECTRA IN STRONG FIELD AUTOIONIZATION
Authors: YAO GUAN-HUA  , XU ZHI-ZHAN  , QU WEI-XING  ,   (1)中国高等科学技术中心(世界实验室)理论物理分中心; (2)中国科学院上海光学精密机械研究所,上海,201800
Published: November 2020

Photoionizing decay of the autoionizing state is taken into account in the model of strong laser field induced autoionization. Photoemiss ion spectra are recalculated and significant power broadening of these spectra is found, which is in contrast with previous predictions using. simpler model.
INVESTIGATION OF FLUORESCENT DYNAMICS ON ErxY1-xAlO3 CRYSTALS
Authors: ZHANG SI-YUAN  , REN JIN-SHENG  ,   中国科学院长春应用化学研究所稀土化学与物理开放研究实验室,长春,130022
Published: November 2020

In this paper, the radiative transition probability, non-radiative transition probability, cross relaxation probability and other spectral parameters are calculated in detail. By considering three kinds of radiative processes, the fluorecent dynamic process is discussed, the relations between the fluorescent character and the concentrations of Er3+ ions are studied, and their laws are given.
A STUDY ON THE ORDER-DISORDER TRANSITION IN A+2(B1/31B2/32)O3 PEROVSKITES
Authors: WANG QIANG  , GU BING-LIN  , ZHANG XIAO-WEN  ,   (1)清华大学材料科学与工程系,北京,100084; (2)清华大学现代应用物理系,北京,100084
Published: November 2020

By use of cluster variation method, a study of orderdisorder transition in A+2(B1/31B2/32)O3 system was carried out. Theoretical calculation indicated that the interaction energy parameter J had a great influnce on formation of both, the (B2/31B1/32)1/2 :B1/22 =1:1 mixed ordered domain and B1/31:B2/32= 1:2 domain, and predicted that it was more difficult to form the B1/31:B2/32= 1:2 full ordered domain relatively to the (B2/31B1/32)1/2B1/22 = 1:1 mixed ordered domain.
A NEW SUPPORTING SCHEME FOR GRAVITATIONAL WAVES ANTENNA
Authors: ZHENG QING-ZHANG  ,   中山大学物理系,广州,510275
Published: November 2020

In this paper, we have proposed a multiple wires homogeneous suspending fashion for gravitational waves antenna, showed that the strain caused by suspending in the antenna can be reduced arbitrarily to avoid the additional noise excited by restricted phonons, and also proved that the influence of this suspending fashion upon the eigen frequency and the Q factor of the antenna can be neglected. Thus, this suspending fashion may be a perfect supporting scheme.
ABOVE-THRESHOLD IONIZAT1ON BY A SMOOTH LASER PULSE
Authors: YAO GUAN-HUA  , YU WEI  , XU ZHI-ZHAN  , CHENG RONG-QING  ,   (1)中国高等科学技术中心(世界实验室)理论物理分中心; (2)中国科学院上海光学精密机械研究所,上海,201800
Published: November 2020

In this paper, using "essential states model" we present an non-perturbative analysis of above-threshold ionization by a Gaussian laser pulse, and discuss the time evolution of its characteristic electron spectra.
FORCED BRUSSELATOR AND CIRCULAR MAPPING
Authors: YU XI-LING  , JIN HUI-QIANG  , YAN GUANG-HUI  , WANG GUANG-RUI  , CHEN SHI-GANG  ,   (1)辽宁大学物理系,沈阳,110036; (2)应用物理与计算数学研究所,北京,100088
Published: November 2020

In this paper, through the discrimination of Farrey sequence and the demonstration of bistable states of the forced Brusselator with weak coupling, it is shown that its phase diagram has the same topological structure with that of the circle map.
THERMAL DISTORTION OF Nd: GLASS HOLLOW CYLINDER LASERS
Authors: HUANG GUO-SONG  , ZHOU FENG  , GU SHAO-TING  , ZHANG GUO-XUAN  , CHEN ZE-XING  ,   中国科学院上海光学精密机械研究所,上海,201800
Published: November 2020

The theoretical analysis and experimental result of steady-state thermal distortion in hollow cylinder lasers are given in this paper. The basic considerations of a 1 kW average power Nd: glass hollow cylinder laser are presented.
NONLINEAR OPTICAL EFFECTS IN CONDUCTING POLYMERS
Authors: SHUAI ZHI-GANG  , SUN XIN  , FU ROU-LI  ,   (1)复旦大学物理系,上海,200433; (2)南开大学数学研究所理论物理研究室,天津,300071; (3)中国科学院上海技术物理研究所红外物理开放研究实验室,上海,200081
Published: November 2020

The third order optical nonlinearity in 1-d conducting polymers are investigated with a simple model. The relevant physical effects on the nonlinear polarization are analysed. For third harmonic generation our result is in good accordance with the experiment of prestine polyacetylene.
ELECTRON CYCLOTRON WAVE HEATING EXPERIMENT ON CT-6B TOKAMAK
Authors: LUO YAO-QUAN  , WANG LONG  , YANG SI-ZE  , CHEN YAN-PING  , QI XIA-ZHI  , LI ZAN-LIANG  , WANG WEN-SHU  , LI WEN-LAI  , ZHAO HUA  , TANG JI-HUI  , TAN FU-CHUAN  ,   中国科学院物理研究所,北京,100080
Published: November 2020

Obvious heating effects have been observed in RF heating experiments on CT-6B tokamak, in which microwave beams of frequencies 34.34 GHz and 20.1 GHz generated by two gyrotron systems were launched from top and outside of the device, respectively. It is shown that these heating effects arise becouse of the different heating mechanisms. The former is due mainly to the resonance heating of O mode. The latter belongs to down shift-over dense heating. Its heating mechanism may be the nonlinear phenomena occuring near the high density cut off layer of X mode. A kind of nonlinear heating phenomena (secondary heating) has been observed in two experiments, which may come from the different physical mechanisms.
ANGULAR DISTRIBUTION OF ABOVE-THRESHOLD IONIZATION OF H ATOM
Authors: CHEN BAO-ZHEN  ,   北京师范大学低能核物理研究所,北京,100875
Published: November 2020

With a model theory we analyse the recenl experiment on the angular distribution of above-threshold ionization of H-atom, and show some rules of the angular distribution. We also discuss the shortcoming of the ordinary perturbation theory in brief.
EFFECTS OF HIGH-ORDER IONIZATION PROCESSES IN INTENSE LASER-FIELD INDUCED AUTOIONIZATION
Authors: CHEN RONG-QING  , YAO GUAN-HUA  , XU ZHI-ZHAN  ,   (1)中国高等科学技术中心(世界实验室)理论物理分中心; (2)中国科学院上海光学精密机械研究所,上海,201800
Published: November 2020

High-order ionization processes, which have been ignored previously in the studies of intense laser-field induced autoionization, are discussed. After obtaining the analytic solution for autoionization spectrum, we investigate in detail the effects of high-order processes. These processes, as shown in the present paper, will affect drastically the autoionization spectrum and the dreesed states of the autoionization state.
Al65Cu20Co15 DECAGONAL QUASICRYSTAL
Authors: WU YU-KUN  , MENG XIANG-MIN  , HE LUN-XING  , GUO KE-XIN  ,   中国科学院金属研究所固体原子象实验室,沈阳,110015
Published: November 2020

X-ray diffraction showed that the conventionally solidified A165Cu20 Co15 alloy consistes mainly of 2-D decagonal quasicrystal (T phase). SEM reveals that T phase formed the perfect morphology of prismoid with 10/m or 10/mmm symmetry. The bounded planes of primoid correspond to the strong spots in the electron diffraction pattern of T phase.
DIAMOND-LIKE CARBON FILMS IMPLANTED WITH VARIOUS ION ENERGY
Authors: XIANG JIN-ZHONG  , ZHENG ZHI-HAO  , XIONG JING  , ZHANG FENG-QING  ,   (1)兰州大学现代物理系,兰州,730001; (2)中国科学院上海冶金研究所离子束开放研究实验室,上海,200050
Published: November 2020

Diamond-like carbon (DLC) films, prepared by RF plasma CVD, were implanted at a dose of 5×1015Ar/cm2 with various ion energy of 50, 100, 140, 180 keV. Before and after ion implantation, IR absorption spectra, Raman spectra, optical gap Eopt, hydrogen contents and resistivities were measured. The results show that C-H bonds are destroyed and sp2 and sp3 components are decreased during implantation. While the ratio of (sp2/sp3) increases with ion energy. The Eopt, resistivities and hydrogen contents decrease with ion energy increasing. Ho-wever, at 180 keV, the above parameters have no evident change. These results are also discussed in this paper.
EFFECTIVE-MEDIUM THEORY FOR TWO-PHASE RANDOM COMPOSITE/SYSTEM
Authors: MA YU-QIANG  , LI ZHEN-YA  ,   苏州大学物理系,苏州,215006
Published: November 2020

In this paper, starting from the relation between two distinct topological structure, we propose a simple self-consistent method based on the Maxwell-Garnett theory, in order to improve the Bruggeman's effective medium theory (mean-field-type approximation). We derive a general expression for the effective conductivity of a two-phase random composite system. The theoretical results on electric and thermal conductivity for some real materials are in good agreement with experimental data.
TEM INVESTIGATION ON SILVER SOLS AFTER ADDITION OF KCl
Authors: FANG YAN  , WANG WEI-NING  , NI DONG-HAI  , FU SHI-YOU  , ZHANG PENG-XIANG  ,   (1)北京师范学院物理系和实验中心; (2)陕西师范大学物理系; (3)中国科学院物理研究所,北京,100080
Published: November 2020

The influence of adding KCI on the silver sols was studied by transmission electron microscopy (TEM). It was found that the Ag atoms on the surfaces of the colloidal silver particles were transported to other positions of the silver surfaces after adding KCI, and the sur-feccs of colloidal silver particles were covered with an atomic group layer which had some kind of structure. At the same time, a chain-like colloidal aggregation in Ag sols was induced by KCI. This was compared with the case of adding pyridine. Also we discussed the effect of adding KCI on the SERS signals of molecules adsorbed on colloidal silver particles.
HYDROSTATIC PRESSURE STUDIES OF DEEP LEVELS AND RELATED CURRENT MECHANISMS IN Hg1-xCdxTe n+-P PHOTODIODES
Authors: YUAN HAO-XIN  , LI QI-GUANG  , JIANG SHAN  , LU WEI  , TONG FEI-MING  , TANG DING-YUAN  ,   中国科学院上海技术物理研究所,上海,200083
Published: November 2020

Theoretical and experimental studies have been made about the electrical characteristics of Hg1-xCdxTe n+-p photodiodes with x=0.5 at room temperature and at hydrostatic pressures up to 2GPa. The observed "anomalous" pressure dependence of the current-voltage characteristics of p-n junctions, which exhibits in the small bias region, has been satisfactorily explained using a theory which takes into account the pressure dependence of deep levels and its effect on deep level-assisted tunneling current. By fitting the dark current to this theory, two deep levels, D1(=Ev + 0.75Eg) and D2( = Ev+0.5Eg), as well as their respective electron and hole lifetimes, were obtained. The pressure coefficients of deep levels in undoped Hg1-x Cdx Te were also obtained.
A STUDY OF EXCITED STATES IN COLLISIONS OF Ne+ IONS WITH LI ATOM
Authors: YU DE-HONG  , PAN GUANG-YAN  , LEI ZI-MING  , YANG FENG  , LIU JIA-RUI  , SUN XIANG  ,   (1)中国科学院物理研究所,北京,100080; (2)中国科学院物理研究所,北京,100080,曲阜师范大学激光研究所
Published: November 2020

We have studied the electron capture and the target excitation in collisions of Ne+ ions with Li atom by observing the emission spectrum. The emission cross sections of the observed lines and the excitation cross sections of the corresponding states are obtained in the visible region. The relations of the electron capture processes with the energy defect and the ionized potential of the target atom are discussed. The energy range of the Ne+ ions is 20-150 keV.
DETERMINATION OF THE ANISOTROPY CONSTANTS Ku AND K1 OF GARNET BUBBLE FILMS BY MEASURING TORQUE CURVES
Authors: TANG GUI-DE  , HAN BAO-SHAN  ,   (1)河北师范大学物理系,石家庄,050016; (2)中国科学院物理研究所,北京,100080
Published: November 2020

The dependence of the magnetic torque of single crystal GGG (Gd3Ga5O12) substrates on their geometry and some related physical parameters were studied. A method was proposed to deduce the substrate contribution in determining the uniaxial anisotropy constant Ku and magnetocrystalline one K1. Both Ku and K1 can be acquired from the magnetic torque curves by employing the two-variable regression and using computer. As example, the measured curves of Ku and K1 as a function of temperature were presented.
THE ODD PARITY AUTOIONIZING SPECTRA OF YBI
Authors: WU BI-RU  , XU YUN-FEI  , ZHENG YOU-FENG  , HU YONG-YAN  , LU JIE  ,   浙江大学物理系,杭州,310027
Published: November 2020

We report here the measurment and results of the odd parity autoionizing spectra of Ybl by the laser multistep excitation technique. More then thirty autoionizing levels were obtained. Our results were compared with the previous ones obtained by one photon absorption and electron collision excition technique.
THE EFFECT OF AGEING ON SOME PROPERTIES OF THE Ni-14.5Cr-1.5Si(wt%) ALLOY
Authors: DENG ZHONG-MIN  ,   昆明贵金属研究所,昆明,650221
Published: November 2020

The effect of ageing on resistivity, thermoelectromotive power vs Pt and specific heat of the Ni-14.5Cr-1.5Si(wt%) alloy was studied. After quenching, this alloy experiences a transformation from disorder to short range order. Results showed that the resistivity inereased signifitantly by ageing, but the thermoelectromotive power and specific heat increased only slightly. X-ray diffraction analysis showed that this is caused by the formation of the δ-second phase, which is a Ni2Si compound.
COLLISION-INDUCED ENHANCEMENT EFFECT OF THE INTENSITIES OF 23∏g—13∑u+ DIFFUSE SPECTRUM FOR K2 DIMER
Authors: ZHANG LI-MIN  , LOU LI-REN  , GUO CHANG-XIN  , MA XING-XIAO  , XIA YU-XING  ,   (1)中国科学技术大学近代化学系,合肥,230026; (2)中国科学技术大学物理系,合肥,230026; (3)中国科学院安徽光学精密机械研究所,合肥,230031
Published: November 2020

The 23Πg-13∑u+ diffuse fluorescence spectrum around 5730? for K2 dimer excited by 4415.6? CW Isser line was obtained. The collision-induced enhancement effect of the maximum intensities Idiff of the diffuse spectrum versus the pressure P ot buffer gas Ar was studied experimentally. The energy transfer processes of C1Πu-23Πg was showed by stable collision model. The Idiff-P relation was deduced and a satisfactory fitting for the experimental data was obtained by use of this model. This fitting showed that the energy crossing rate and collision-induced transfer rate could be obtained by this model with some alternations of the experimental setup.
GREEN'S FUNCTION THEORY OF PHASE TRANSITION IN HYDROGEN-BOND FERROELECTRICS (Ⅱ)
Authors: WANG CHUN-LEI  , QIN ZI-KAI  , D. L. LIN  ,   (1)美国纽约州立大学Buffalo分校物理学和天文学系; (2)山东大学物理系,济南,250100
Published: November 2020

Based on our paper (I), we calculate the free energy of the hydrogen-bond ferroelectrics system with four-body interactions, and propose the conditions to determine the Curie temperature and the discontinuity of the first order phase transition. The detailed analysis of free energy around the transition temperature indicates that the results of our microscopic model coincide with the predictions of Landau's theory. And the relations between the coefficients in Landau free energy and the microscopic interaction constants are obtained, that makes the physical meaning of these coefficients more clear. By comparing with the experimental data of PbHPO4, PbDPO4 and H2C4O4 crystals, we confirm that our theory can successfully explain the first order ferroelectric phase transition as well as the second order transition.
FORMATION OF BULK METALLIC GLASS OF Pd-Ni-P AND TRANSFORMATION KINETICS
Authors: XU YING-FAN  , WANG WEN-KUI  ,   中国科学院物理研究所,北京,100080
Published: November 2020

This paper reports the result of undercooling experiment of Pd-Ni-P alloy. Bulk metallic glass of Pd41)Ni40P19 has been formed by thermal treatment with B2O3 as fluxing. The effect of cooling rate on the undercooling behavior was studied. The surface heterogeneous nuclea-tion was reduced by embeding the sample into B2O3 melt. Thus the cooling rate used to form the glass was as low as 1 K/s at the glass transition temperature of 590 K. The temperature-time-transformation curves were calculated by using the classical homogeneous and heterogeneous nucleation theory. The critical cooling rates for the glass formation were calculated. The resuits are discussed in some detail.
XRD AND SEM STUDY ON THE PHASE SEPARATION AND CRYSTALLIZATION BEHAVIOR FOR AN AMORPHOUS Cu+ CONDUCTOR
Authors: YANG YUAN  , HOU JIAN-GUO  , YU WEN-HAI  ,   中国科学技术大学材料科学与工程系,合肥,230026
Published: November 2020

The X-ray diffraction (XRD) and scanning electron microscopy (SEM) study was carri-ed out for an amorphous Cu+ conductor 0.4CuI-0.3 Cu2O-0.3P2O5 with the simultaneous conductivity measurement in the isothermal heat treament process. The results indicated that the initial amorphous material was phase-separated. In the course of time, the separated amorphous phase disappeared, the crystalline γ-Cul and Gu2P2O7 formed in sequence and grew up gradually. The correlation of the phase separation and crystallization behavior with the con-ductiyity anomaly confirmed again the interface effect between different phases in amorphous fast ionic conductors and its universality.
THEORY OF TWO-DIMENSIONAL FERMI LIQUIDS (Ⅱ)——LANDAU PARAMETERS OF 2-D LIQUID 3He
Authors: CUI SHI-MIN  , CAI JIAN-HUA  ,   (1)上海交通大学凝聚态物理研究所,上海,200030; (2)中国高等科学技术中心(世界实验室)理论物理分中心
Published: November 2020

2-D liquid 3He is studied using the method of correlated basis functions (CBF). The cluster expansion technique is extended to treat finite temperature systems based on variational principle for the partition function. Adopting a Lennard-Jones potential, the ground state energy, quasi-particle energies and the Landau parameters are evaluated to the second order.
THEORY OF TWO-DIMENSIONAL FERMI LIQUIDS (Ⅲ)——TRA-NSPORT PROPERTIES AND SOUND PROPAGATION
Authors: CUI SHI-MIN  , CAI JIAN-HUA  ,   (1)上海交通大学凝聚态物理研究所,上海,200030; (2)中国高等科学技术中心(世界实验室)理论物理分中心
Published: November 2020

We discuss transport properties and sound propagation of 2-D Fermi liquids. Microscopic expressions for the coefficients of diffusion, viscosity and thermal conductivity are derived using Resibois method. Velocities of the zeroth and first sounds are calculated. Based on an analysis of collision integral, it is shown that a series of relaxtion time parameters is necessary to define precisely the sound propagation properties in 2-D Fermi liquids, in contrast to the 3-D case.
THE SPECTRAL FUNCTIONS OF SELF-SIMILAR STRUCTURES
Authors: ZHONG XI-HUA  ,   北京大学物理系,北京,100871
Published: November 2020

IB this paper, two self-similar plane structures are designed, the corresponding diffraction screens arc made and its Fraunhofer pattern are obtained. Based on the view point of successive re-production, the spectral recurrence formulas are deduced, and aseries of spectral functioa curves are drawn. Finally we discuss some characters of the curves. This investigation provides an optical analogue method for researching practical self-similar problems.
NONLINEAR THEORY OF LOW FREQUENCY INSTABILITIES IN A HOT ELECTRON PLASMA
Authors: HUANG CHAO-SONG  , WU YING  ,   (1)华中理工大学物理系,武汉,430074; (2)中国科学院武汉物理研究所,武汉,430072
Published: November 2020

Nonlinear behaviors of low frequency drift instability and interchange instability in a hot electron plasma are analyzed. Nonlinear coupled equations describing evolution of perturbed densities are derived. Saturated amplitudes of plasma perturbations are found. Effects of the hot electron component on the saturated amplitudes are discussed. The amplitude of perturbed density of the drift wave is about 20%, and that of the interchange mode is about 5%. The amplitudes of plasma perturbations vanish if the hot electron component satisfies the linear stability criteria of the instabilities.
SPIN WAVES IN TRANSVERSE ISING FERRO-MAGNETIC FILMS
Authors: DAI SONG-TAO  , LI ZHEN-YA  ,   苏州大学物理系,苏州,215006
Published: November 2020

In this paper, we study the spin waves in transverse Ising ferromagnetic films by means of the Green function theory. The dependence of the spectrum and intensity of spin waves on the parameters related to the film is discussed in detail
A STUDY OF COERCIVITY AND PRECIPITATION IN SmCo5
Authors: PAN SHU-MING  , JIN HAN-MIN  ,   (1)北京有色金属研究总院,北京,100088; (2)吉林大学物理系,长春,130023
Published: November 2020

Positron annihiation, in situ observations of heating process by using 1000 kV HVTEM as well as magnetic measurements have been used to study the coercivity mechanism. The results show that Sm2Co17 precipitates themselves are not nucleation centres for the formation of reverse domains. It seems reasonable that some structural and compositional inhomogeneous regions have a fairly low magnetic anisotropy which may act as nucleation centres.Experiments show that the maximum irreversible loss appears at 750℃ during aging from 25℃ to 900℃ for SmCo5. The magnetic anisotropy of the central Sm3+ with different near neighbour Sm3+ ion distribution is not fixed. The more the structure simitar to Sm2Co17, the more probable that Sm3+ is negatively anisotropic.
OPTICAL PHASE CONJUGATION BY STIMULATED BRILLOU-IN SCATTERING IN THE PRESENCE OF SELF-FOCUSING
Authors: HUANG YONG  , GONG QI-HUANG  , YANG JIA-SUN  ,   北京大学物理系,北京,100871
Published: November 2020

Phase conjugation with high quality can be obtained by stimulated Brillouin scattering in the focused beams' scheme, even when the in homogeneous pump light contains a self-focusing strong component. The scattered light originates from the selftrapped filament regions. The conjugation fraction η depends on the intensi ty ratio a of the strong component and the total incident light, attaining a maximum ηmax (=80%) at a certain value of σ. By taking in-tc account the effect of self-focusing on η(σ), a fair agreement with experiments is obtained.
RELATIONS BETWEEN DIFFERENT METHODS FOR SOLVING SOUTON EQUATIONS
Authors: XIAO YI  ,   华中理工大学物理系,武汉,430074
Published: November 2020

The fundamental equations and results of different methods for solving soliton equations are deduced by using the projection matrix method. A simple and unified discription of the-relations between these methods is presented.
COMPRESSION EXPERIMENTS OF NEON-FILLED GLASS MICROBALLONS IRRADIATED BY TWO 1.06μm LASER BEAMS
Authors: HE SHAO-TANG  , ZHANG TAN-XIN  , YANG XIANG-DONG  , DING YAO-NAN  , CHENG JIN-XIU  ,   (1)北京应用物理与计算数学研究所,北京,100088; (2)西南核物理与化学研究所,成都,610003
Published: November 2020

The compression experiments with neon-filled microballoons were performed using Shen-guang (1012 W) neodymium glass laser facility. The results showed that the laser-driven implosion compression ratio was about 70, the electron density reached 1023 cm-3, the averaged implosion velocity was about 3.3×107 cm/s.
NONLINEAR DYNAMICS OF ONE-DIMENSIONAL CRYSTALLINE BEAM (Ⅰ)
Authors: SHAO MING-ZHU  , I. HOFMANN  , LUO SHI-YU  ,   重庆交通学院,重庆,630073,西南师范大学,重庆,630715
Published: November 2020

A coherent oscillation equation for one-dimensional Coulomb chain has been derived, which is the well-know Duffing equation, and some single modes have been discussed. An approximate solution has been found, and stability of system has been analysed. Besides, we have derived the error of magnetic field and some thermodynamic parameters, and also some critical parameters for ESR at GS1 of FRG.
TEMPERATURE-DEPENDENT 11B NMR STUDIES OF Na2O·B2O3 GLASSES
Authors: XU SHU  , WU XUE-WEN  ,   华东师范大学分析测试中心,上海,200062
Published: November 2020

The molten structure of Na2O·B2O3 glasses are investigated by the temperature-dependent 11B CW-NMR technique. The results show that, as R≤0.5 there are two stable configurations in the molten state. One configuration, occuring at 730-780℃, has two bridge-oxygen atoms between two boron atoms; and the other configuration, occuring at 880-920℃, has three bridge-atoms between two boron atoms. But only the first configuration exists as R>0.5.
COLLISION INDUCED DISSOCIATION (CID) (Ⅱ)——THE STUDY OF THE COLLISION-INDUCED QUENCHING MECHANISM OF I2(B3∏o+u) AT HIGH VIBRIONAL LEVEL V′=62
Authors: XIANG TIAN-XIANG  , LI CHONG-DE  , WANG LI-ZONG  , WU MIN  , HUANG YING  ,   南京大学化学系,南京,210008
Published: November 2020

This paper covers our recent study of the quenching processes of I2(B3Πo+u) at high vi-brational level v′= 62. In the experiments, quenching rate constants of I2* with itself and with other molecules (He, Ar, Kr, H2, CO, N2, O2, CH4, NH3, C2H6) were determined, and it was found that in the collision process of I2* and NH3, the formation of the metastable complex (I2*…NH3) might be one of the major processes for fluorescence quenching. The quenching efficiency of the polar molecule, CO, is larger than other molecules, such as the :isoelectronic molecule, N2, showing that intermolecular dipole-induced dipole interaction may play an important role in enhancing the molecular quenching. More important, the theory for collision-induced dissociation (CID) proposed in paper 1 can satisfactorily model the experimental results, indicating strongly that in such high vibrational level, collision-induced direct dissociation is the dominant path.
LINE-FOCUSED LASER PRODUCED PLASMA STUDIES USING A PTGS
Authors: WANG XIAO-FANG  , CHEN SHI-SHENG  , XU ZHI-ZHAN  , LI YUE-LING  , QIAN AI-DI  ,   中国科学院上海光学精密机械研究所,上海,201800
Published: November 2020

The spectral and spatial characteristics of X-ray emission (5-200?) along or off the axis of the plasma column, produced by 1.06 μm laser beam irradiating luminum flat target in line focused configurations with an average power density 2×1012W/cm2, are studied by using a pinhole transmission grating spectrograph (PTGS). Problems for the plasma as an X-ray-laser gain medium are also discussed.
EFFECT OF HYDROGEN ON THE BEHAVIOUR OF IRRADIATED DEFECTS IN IRON
Authors: WAN FA-RONG  , ZHU XIAO-FENG  , XIAO JI-MEI  , YUAN YI  ,   (1)北京科技大学材料物理系,北京,100083; (2)中国高等科学技术中心世界实验室凝聚态与辐射物理分中心
Published: November 2020

The interaction between hydrogen and irradiated defects in iron was studied. Different kinds of complexes of hydrogen and defects would form if hydrogen was trapped by the defects. During aging at various temperatures, it was observed that interstitial-type loops formed above 300℃, vacancy-type loops formed above 450℃ and voids formed at 520℃. We consider that such complexes as H-I or H-Is, H-V and H-Vs result in interstitial-type loop, vacancy-type loop and void, respectively.
PHOTOEMISSION STUDIES ON THE BLUE TUNGSTEN OXIDES
Authors: XIE KAN  , QI SHANG-XUE  , WU NAI-JUAN  , LIN ZHANG-DA  ,   中国科学院物理研究所,北京,100080
Published: November 2020

A series of studies were conducted for surface valency in blue tungsten oxides by using pho-toemission technique. Rusults show that, the blue tungsten oxide contains not only one kind of valency, but conbination of two valences, namely the conbination of W+5 and W+6, and also the process of argon ion eching and high temperature treatment all induce the loss of oxygen in W-chemical reduction process, which causes W transfer from high valence to low valence. Meanwhile, the density of state near Fermi level increases with the change from high valence to low valence.
FLUX CREEP IN HIGH Tc YBa2Cu3Oy BULK SUPERCONDUCTOR
Authors: ZHANG FENG-YING  , HUANG SUN-LI  , CAO XIAO-WEN  ,   中国科学院等离子体物理研究所,合肥,230031
Published: November 2020

Flux creep in high Tc oxide YBa2Cu3Oy superconductor in critical state has been studied by observing variation of magnetization with time. Experimental results show that for the zero field cooling sample, the magnetization decays with time following the law M∝lnt over the observation time period, and this process accompanies by the occurrence of flux jumps. The rate of the magnetization decay dM/dlnt, as a function of the field, exhibits a maximum near H=3HP. It is believed to be related to weak link superconductivity. dM/dlnt decreases monoto-neously with the rising temperature in the temperature range above 77K. Finally, a discussion is made about the activation energy of the flux lines U0.
NEUTRON IRRADIATION EFFECTS OF Cu50Ti50 METALLIC GLASS
Authors: WU GUO-AN  , DONG YUAN-DA  , XIAO KE-QIN  , HE YI-ZHEN  ,   (1)西南反应堆工程研究设计院,成都,610005; (2)中国科学院固体物理研究所,合肥,230031
Published: November 2020

The effects of fast neutron irradiation on a Cu50Ti50 metallic glass are studied by X-ray diffraction and differential scanning calorimetry (DSC) measurements. It was found from DSC measurements that not only the position but also the profile of crystallization peaks were affected by irradiation. The irradiation was also seem in X-ray diffraction to produce changes opposite to those caused by low-temperature annealing. All these changes are finally discussed in conjunction with the relation between the fast neutron irradiation and the change of short range ordering of Cu50Ti50 metallic glass.
REFLECTION OF AND REFRACTION OF FINITE AMPLITUDE SOUND WAVE ON PLANE BOUNDARY OF HALF SPACE
Authors: ZHENG XIAO-YU  , QIAN ZU-WEN  ,   中国科学院声学研究所,北京,100080
Published: November 2020

Based on the theory of reference [1] , a further investigation of the reflection and refraction of finite amplitute sound waves on a plane boundary between two media is made, and a solution of the refracted sound field in the second medium is obtained. Some problems about boundary condition and refraction law are analysed.
PHASE TRANSITIONS AT CRITICAL POINTS IN OPTICAL BISTAB1LITY
Authors: OU FA  , DENG WEN-JI  ,   华南理工大学,广州,510641
Published: November 2020

Critical phenomena in optical bistability (OB) are studied in some detail. Theoretical an-alyeses, mainly based on the steady solution of the "thermodynamic" Fokker-Plank equation for absorptive OB, show that the critical phenomena in OB also can be brought into the framework of Landau's theory of scond-order phase transitions, and the relations between different kinds of critical index numbers obey the scaling laws.
A STUDY ON THE SPECTRUM OF Agl(Cr2O3) COMPOSITE ION-CONDUCTOR
Authors: WANG YU-XIA  , WANG LI  ,   (1)中国科学技术大学材料科学与工程系,合肥,230026; (2)中国科学技术大学材料科学与工程系,合肥,230026 89届本科毕业生
Published: November 2020

In this paper, we present the study on the infrared absorption spectrum, near ultraviolet region and visible region reflection spectrum of Agl(Cr2O3) composite ion-conductor. It is found that the two spectra observed are not the same as that of pure Agl and Cr2O3. There is a new absorption peak in the range of 882-889 cm-1 in infrared spectrum. The photodis-sociation characteristic at long wave direction from 430 nm of Agl disappears in electronic spectrum. The reflection spectrum hands of d-d absorption transition caused by ligand field effect of Cr2O3 are centered at 410 nm and 530 nm. For Agl(Cr2O3), the band at 410 nm disappears and the band at 530 nm shows red-shift and its intensity decreases with the increasing of Cr2O3. There is more strong absorption in the whole ultraviolet and visible region Based on the concept of the double-phonon coupling, the distortion polarization of medium and the ligand theory, combining with the TEM results, the phonon spectrum and electronic spectrum of Agl(Cr2O3) compsite ion-conductor are analyzed.
EFFECTS OF THE SPACE AND TIME DISORDER ON ULTRASONIC RELAXATION IN GLASSES ——GENERALIZED INFRARED DIVERGENCE ROSPONSE THEORY
Authors: WANG GUO-LIANG  , DAI PEI-YING  ,   郑州大学物理系,郑州,450052
Published: November 2020

The effects of the space and time disorder on the survival probability of tunneling states and the relaxation time are analysed with the theory of continuous-time random walk (CTRW) on fractals. The infrared divergence response (IDR) theory is generalized and made possible to explain the relaxation phenomena in metal glasses.
A THEORETICAL STUDY ON THE MAGNETIC FIELD OF A RECORDING HEAD WITH ARBITRARY POLE-ANGLE
Authors: YAO XUE-BIAO  ,   安徽大学物理系,合肥,230039
Published: November 2020

In this paper, the distribution of the magnetic field of a recording head with arbitrary pole-angle in the vicinity of the head's air gap is studied by the method of Schwartz-Christ-offel transformation. The theoretical formulas are real, and the numerical values of the distribution of the field are obtained. Some applications are also discussed.
MATRIX ELEMENTS OF ELECTRON INTERACTION IN POLYMER
Authors: SUN XIN  , CHEN HONG-YI  , WU CHANG-QIN  , FU RONG-TANG  , FU ROU-LI  ,   (1)Department of Physics,University of Texas.Austin.Texas 78712,USA.; (2)复旦大学物理系,上海,200433; (3)中国科学技术大学结构分析开放研究实验室,合肥,230026; (4)中国科学院上海技术物理研究所红外物理国家实验室,上海,200081
Published: November 2020

In order to explain why the enhancement or reduction of dimerization of polymer is only determined by the range of electron interaction, the diagonal and off-diagoal matrix elements of screened Coulomb interaction are calculated, and it is shown that the off-diagonal matrix elements are getting more and more important when the interaction range decreases. The Competition between the off-diagonal and diagonal interactions causes the transition from enhancement of dimerization to reduction.
COHERENT STATES OF HYDROGEN ATOM
Authors: XU BO-WEI  , ZENG QI  ,   上海交通大学物理系,上海,200030
Published: November 2020

From Kustannheimo-Stiefel transformation, the hygrogen problem in quantum mechanics can be transformed to that of a four dimensional isotropic harmonic oscillator with constrain. The coherent states are defined, for which the expectation values of the position and the momentum are shown to give the classical Kepler orbits. The uncertainty relations for the coherent states are discussed as well.
EXCITATION OF SHEAR ALFVEN WAVES IN KT-5B TOKAMAK
Authors: HAN SHEN-SHENG  , ZHU SHI-YAO  ,   (1)中国科学技术大学近代物理系,合肥,230026; (2)中国科学技术大学近代物理系,合肥,230026;中国科学院上海光学精密机械研究所博士后流动站
Published: November 2020

In this paper, the experimental results of Alfven wave excitation in KT-5B Tokamak are presented. The results show that there is a quite broad excitation region for shear Alfven waves, the wave energy coupling indicated by the antenna loadings increase as the plasma current and toroidal magnetic field increase. The electron temperature threshold effects and the preliminary evidence of the surface electrostatic wave are observed.
THEORETICAL INVESTIGATION ON THE PRESSURE BEHA-VIOR OF NITROGEN BOUND EXCITONS IN GaP AND GaAs1-xPx
Authors: ZHANG YONG  , ZHENG JIAN-SHENG  , WU BO-XI  ,   厦门大学物理系,厦门,361005
Published: November 2020

Using a Koster-Slater one band-one-side approximation, the relationship between the pressure behavior of nitrogen bound excitons and the band structure is investigated in GaP and GaAs1-xPx. An analytical expression is found to be a good approximation for the pressure coefficient of the deep impurity state. The pressure coefficients of N and NNi bound exciton states are calculated in GaP and GaAs0.17P0.83. A tentative new assignment which agrees with experiments in both ordering of levels and pressure coefficients is given for nitrogen pair configurations.