bluuebunny/crossref_metadata_2025 huggingface dataset:
LASER-INDUCED DAMAGE IN LiNbO3:Fe
Authors: WU ZHONG-KANG  , ZHANG JIA-MIN  , LIU SI-MIN  , WANG HUA-FU  , ZHANG GUANG-YIN  , LU YONG-BIN  , XU LIANG-YING  , XU YU-HENG  ,   (1)哈尔滨工业大学化学系; (2)南开大学物理系; (3)中国科学院上海硅酸盐研究所
Published: November 2020

We have investigated the surface damage induced by visible laser in LiNbO3:Fe. The laser damage tracks (glide lines and microcracks) and microdomains are produced at +c side of the periphery of light-illuminated regions. These microdomains arise at laser damage tracks and at cylindrical grooves on the surface of sample. We also found that these damage defects in LN:Fe can be decorated by space-charges due to photovoltaic effect and they are directly observable between crossed polarizers. Role of the cavity field, the electrostatic repulsive force at the doma-in boundary and self-enhanced diffraction light induced by physical imperfection on laser-induced surface damage are discussed.
THE KINETIC THEORY ON rf WAVE CURRENT DRIVING IN NON-UNIFORM PLASMAS
Authors: PAN CHUAN-HONG  ,   中国西南物理研究所
Published: November 2020

We used the Green's function method to solve the quasilinear Fokker-Planck equation and obtained the rf wave current-driving effeciency in non-uniform plasmas. It is shown that the current-driving effeciency increases considerably if the non-uniformity is taken into account, and the effeciency decreases with increasing β.
THE CONDUCTION PROPERTIES OF ELECTRONS IN CeBi UNDER PRESSURE
Authors: JIN BIAN-JUN  , HUANG TONG-KAI  , ZHONG FAN  , MENG RU-LING  ,   (1)上海工业大学; (2)上海科学技术大学; (3)中国科学院物理研究所
Published: November 2020

The electrical resistivity of CeBi single crystal has been measured in the temperature range 4.2-273 K and under pressure up to 18 kbar. The experimental results show that the Neel temperature increases with pressure and the magnetic resistivity ρs varies proportionally to InT at T>TN. By using Anderson model and taking into account p-f mixing mechanism, we calculated the pressure dependence of CeBi magnetic resistivity. The present results are compared with the experimental data. It is shown that the distance between the 4f level and the Fermi level decreases with rising pressure and pressure enhances the p-f interaction.
STUDY ON THE ELECTRICAL PROPERTIES AND MAGNETIC RESONANCE OF NONCRYSTALLINE MATERIALS IN THE Li2O-P2O5-V2O5 SYSTEM
Authors: CHUI WAN-QIU  , RUAN LI-JIAN  ,   武汉工业大学
Published: November 2020

The conductivity, NMR and ESR spectra of the specimens in the Li2O-P2O5-V2O5 system are measured. Conductivity measurements on these materials reveal a sharp break in the slope of the curve of log conductivity vs reciprocal temperature in the vicinity of transformation temperature. And the conductivity shows abnormal increasemant during pre-crystallization process above the break point, this is caused by the increase of degree of ordering during that process. Valency state analysis of vanadium ions by ESR show that only V4+ and V5+ ions exist in these materials. When P2O5/V2O5 mote ratio is fixed, the 7Li-NMR and V4+-ESR line width narrow clown continonsly with increasing lithia content, this indicates that ionic conductivity increases and electronic conductivity decreases continously in these materials. At first, conductivity de-creases with the increasement of lthia content, but it increases when lithia content exceeds 30 mol%. The conduction mechanism of these materials was also discussed.
THE EFFECT OF PARALLEL CONDUCTANCE IN AlGaAs/GaAs HETEROJUNCTION
Authors: SHI CHANG-XIN  , XIN SHANG-HENS  , WU DING-FEN  ,   (1)上海交通大学大规模集成电路微细加工研究所; (2)中国科学院上海冶金研究所
Published: November 2020

The relationship between the gate voltage and charges in the parallel conducting layer has been calculated for AlGaAs/GaAs heterojunction, which is at large gate voltage and has the effect of parallel conductance. Then, the transconductance characteristics of the high electron mobility transistor (HEMT) is obtained. The comparison of theory and experiments are also made, and we find that they are in good agreement.
MEASUREMENT OF THE (5p3/2ns)1 AND (5p3/2nd)3 AUTOIONIZING LEVELS OF STRONTIUM BY THE MULTI-STEP EXCITATION TECHNIQUE
Authors: WU BI-RU  , ZHANG SEN  , ZHONG JIAN-WEI  , QIU JI-ZHEN  , HU SU-FEN  , LU JIE  , SUN JIA-ZHEN  ,   浙江大学物理系
Published: November 2020

The (5p3/2ns)1 (n = 13-21), (5p3/2nd)3 (n = 13-24) autoionizing levels of strontium have been measured by the laser multi-step excitation method and polarization technique. In the core excitation profiles for the (5p3/2ns)1 states below the 5p1/2 ionization limit, distortions appear at locations corresponding to the (5p1/2ns), and (5p1/2nd)1 levels. Distortions also appear in the (5p3/2nd)3 excitation profiles. These results show that there exist interse-ries interactions between the (5pjns) and (5pjnd) autoionizing series of strontium.
A TOTAL ENERGY LDF-DVM STUDY ON THE CHEMISORPTION OF IODINE ON Si AND Ge(111) SURFACES
Authors: YE LING  , ZHANG KAI-MING  ,   复旦大学物理系
Published: November 2020

As self-consistent LDF-DVM method is used to study the chemisorption of I/Si(lll) and I/Ge(lll). Two cluster models are adopted to simulate the top site and 3-fold site respectively. The optimum geometry is determined by minimizing the total energy. Chemisorption of iodine on top site is found to be more stable than that on 3-fold site. The results are in good agreement with the of SEXAFS. A series of DOS are calculated for the chemisorption of column VII elements F, Cl, Br, I on the top site of Si(lll) surface. The results are analysed and compared with experiments and other theories. In addition, the applicability and limitations of semi-empirical method EHT are discussed.
A STUDY OF INCLUSIONS AND DISLOCATIONS IN LiNbO3 CRYSTALS BY X-RAY TOPOGRAPHY
Authors: GE CHUAN-ZHENG  , JIANG SHU-SHENG  , MING NAI-BEN  , FENG DUAN  ,   南京大学固体物理研究所
Published: November 2020

The inclusions and dislocations in LiNbO3 crystals have been studied by means of X-ray topography. The influence of elastic anisotropy on the contrast of inclusions was observed. The Burgers vectors of dislocations in this crystals were found to be of the type of 1/3〈1120〉, the smallest lattice vector, and 1/3〈0111〉, the next smallest lattice vector. The pure twist sub-boundary which consists of two sets of pure screw dislocations with Burgers vectors l/3〈101l〉 was also observed.
THE ADSORPTION 6F WATER ON SODIUM PREDEPOSITED InP(111) SURFACE
Authors: DONG GUO-SHENG  , DING XUN-MIN  , HOU XIAO-YUAN  , WANG XUN  ,   复旦大学表面物理实验室
Published: November 2020

The room temperature adsorption of water on clean and sodium predeposited InP(lll) surface has been studied by UPS and HREELS. The sticking coefficient of water on InP(lll) surface increases significantly as the surface is covered with 0.3 moiiolayer of sodium. This sticking coefficient enhancement could be shown to be related to the charge transfer between the sodium atoms and the surface phosphorous atoms. Water species adsorb On the surface mainly in the form of undissociated molecules. The existence of P-H bond related loss energy peak at 282 meV observed in HREELS suggests that a portion of water molecules may interact with sodium atoms predeposited on the surface or possibly decomposed on the surface to release free hydrogen atoms which could make bonding with surface phosphorous atoms.
ELECTRONIC STRUCTURES OF THE MIXED CHALCOGENIDE PAIRS IN Si
Authors: GU YI-MING  , REN SHANG-YUAN  ,   中国科学技术大学物理系
Published: November 2020

Using the Green's function method with a tight binding Hamiltonian, the electronic structures of the ground states of S0/Se0, S0/Te0 and Se0/Te0 mixed pairs in Si are investigated. Two A1 symmetrical states are introduced by the mixed pairs, the bonding A1 state is higher than the antibonding A1 state. The numerical results of the energy leveals of mixed pairs are obtained, which are in agreement with the experimental observations. It looks likely that the unidentified shallower energy leveals (S0/Se0 (X1), S0/Te0 (X1), Se0/Te0 (X1)…) are not introduced by the mixed pairs with other non-nearest positions. We note that the transfer direction of the s wavefuction between two different defect atoms in Si is reversed as compare with the ordinary diatomic molecule case. The physical reason is discussed.
A STUDY OF THE SPECTRAL CHARACTERISTICS OF YGG:Cr3+ CRYSTAL
Authors: GAO WEN-BIN  , CHEN JUN-DE  , YANG SHI-JUN  , YE LI-LI  , LU SHI-PING  , WEN GEN-WANG  ,   (1)中国科学院安徽光学精密机械研究所,合肥; (2)中国科学院安徽光学精密机械研究所,合肥杭州电子工业学院; (3)中国科学院安徽光学精密机械研究所,合肥湖南师范大学物理系
Published: November 2020

The spectral characteristics of YGG:Cr3+ crystal was investigated experimentally. The absorption spectrum at 300 K and the fluorescence spectrum at 10 K, 133 K, and 300 K are presented. The fluorescence life time, nonradiative transition propability and radiative quantum efficiency as the function of temperature are also presented. Based on the absorption spectrum and the fluorescence spectrum, with the perturbation of C3iS6 low symmetry field, the individual sub-staes resulting from the splitting of Cr3+ 2T1 state in the YGG host, and the location of R line due to 24A2→E zero phonon transition are determined.
BR1LLOUIN SCATTERING FROM BISMUTH SUBSTITUTED IRON GARNETS
Authors: LIU YU-LONG  , ZHANG PENG-XIANG  , MO YU-JUN  , TU AN  ,   中国科学院物理研究所
Published: November 2020

Brillouin scattering spectra of bismuth substituted iron garnets BixY3-xFe5O12 (x = 0, 0.14, 0.36, 0.54) were measured. The thermally excited bulk magnons were observed. Some magnetic parameters of these samples were determined according to the dispersion relation of the bulk magnons. We found that there is a dependance of the spin wave stiffness constant on bismuth contents, the higher the bismuth contents, the smaller the spin wave stiffness constant.
RESEARCH ON THE STABILITY OF THE HIGH PRESSURE DISCHARGE EXCITED XeCl EXCIMER LASER
Authors: LOU QI-HONG  ,   中国科学院上海光学精密机械研究所
Published: November 2020

The stability of the high pressure discharge excited XeCl excimer laser are related to the concentration of halogen donor HC1. In this paper, a theoretical analysis of the equation for continuity of the electrons in the discharge plasma predicate that the duration of the uniform phase should vary as the inverse square root of the HC1 concentration. This prediction is in good agreement with experimental results obtained from a X-ray pre-ionized PFN pumped XeC1 excimer laser.
D3d SYMMETRIC LOCAL SPECTRAL DENSITIES AND THE ELECTRONIC STRUCTURES OF SUBSTITUTIONAL PAIRS IN Si
Authors: GU YI-MING  , REN SHANG-YUAN  ,   中国科学技术大学物理系
Published: November 2020

By using the irreducible representation basis functions of the point group whose symmetry is lower than Td, a decomposition of the total density of states is considered. The calculation-results are obtained for the D3d point group in Si. Combining with the Koster-Slater Green's function method and on site approximation, the calculation results are used to analyse the electronic structures of the divacancy and the chalcogenide paris (S20, Se20, Te20) in Si. Some interesting results are obtained as follows; The distribution of the local spectral densities closely related to the deep states in forbidden band is similar for point and pair defects. Under the expellant action caused by the local spectral density, the symmetrical A10s (chalcogenide pairs) and Eg, (divacancy) states are higher than the antisymmetrical A2us (chalcogenide pairs) and Eu, (divacancy) states. The distribution of the deep state wavefuctions in Bloch space is also, similar for point and pair defects.
A METHOD TO DETERMINE THE SPECIFIC CONTACT RESISTANCE OF METAL-SEMICONDUCTOR CONTACT——CIRCULAR RING STRUCTURE METHOD
Authors: ZHU DE-GUANG  , WU DING-FEN  ,   中国科学院上海冶金研究所
Published: November 2020

In this paper, a method to determine the specific contact resistance of metal-semiconductor contact——circular ring structure method is presented. The equations for specific contact resistance which are used to both the definite thick and semiinfinite samples were derived. Some measurements and calculations have been carried out, the results are in good agreement with chose of methods published in the literature.
EFFECT OF DIAGONAL DISORDER ON SUPERCONDUCTIVITY IN THE TRIPLET BIPOLARONIC SYSTEM
Authors: LI YAN-MIN  , ZHANG LI-YUAN  ,   (1)北京大学物理系; (2)中国科学院物理研究所
Published: November 2020

The effect of diagonal disorder on superconductivity of the triplet bipolaronic system with a two-delta random site energy distribution is analysed in the framework of the mean-field approximation. It is found that this kind of disorder strongly affects superconductivity of the system. When the triplet bipolaron concentration is near 1/2, the transition temperature decreased seriously; while when the concentration is small, the normal random site energy can not impede the occurence of superconductivity completely. This results from the tunneling motion of triplet bipolarons. It is therefore expected that superconductivity may appear in some amorphous semiconductors with low bipolaron concentration.
DISPERSION RELATION OF GENERAL MAGNETICALLY CONFINED WEAK RELATIVISTIC PLASMAS
Authors: GUO SHI-CHONG  , CAI SHI-DONG  ,   中国科学院物理研究所
Published: November 2020

The dispersion relation for weak relativistic inhomogeneous plasma in general magnetic field configurations is derived from the relativistic gyrokinetic equations, which is valid for arbitrary frequencies. In the derivations the singular integrations with the quadratic denominator are represented by the drift plasma dispertion functions. This dispersion relation can be used to study the various micro instabilities driven by gradient and curvature of B, weak relativistic effects, and/or gyrofrequency shift. Extending the results to the nonequilibrium case such as loss-cone distribution is simple and straight forward. For demonstration, we apply it to investigate the lower hybrid drift instability. Using this dispersion relation we can recover the re-suits of Drake et al. in a straight forward and much more transparent way.
RADIAL RESONANT ELECTRON FLOW DRIVEN BY LOWER-HYBRID WAVES
Authors: XIA MENG-FEN  , WU WEI-MIN  ,   北京大学物理系
Published: November 2020

In lower-hybrid current drive Tokamak, the waves can drive radial resonant electron flow, which is composed of an average flow and a diffusion flow. The characteristics and the effects of the radial flow are discussed.
CHARACTERISTIC INVESTIGATION OF A ULTRASHORT LIGHT PULSE PASSAGE THROUGH THE COLOURED LiF CRYSTALS
Authors: LIN XING  , ZHANG WENG-ZHENG  , WU FENG-TIE  , ZHENG YUN-SHAN  , CHEN QI-XIONG  , SUN ZHAN-AO  ,   (1)华侨大学应用物理系; (2)中国科学院上海光学精密机械研究所
Published: November 2020

In this paper, we report the behavior in various cases of ultrashort light pulse with about 10 ps duration (1.06 μm) passing the nonlinear medium, coloured LiF crystals. The interval of pulse trains becomes shorter than before. Pulse durations become shorter when crystal is thiner and become longer when crystal is thicker. These phenomena are related to the characteristics of the coloured LiF crystals.
THE HEAVY-FERMION BEHAVIOR IN THE RARE-EARTH AND ACTINIDE COMPOUNDS
Authors: CHEN CHANG-FENG  , ZHANG LI-YUAN  ,   北京大学物理系固体物理研究所
Published: November 2020

In this paper, the periodic Anderson Hamiltonian has been used to study the heavy-fermion behavior in the Rare-Earth and Actinide compounds. The mean-field approximation has been applied to the Coulomb correlation term between the f electrons and a self-energy term has been introduced to represent the effect of the many-body interaction. The single-site approximation has been used for the self-energy term. The properties of the systems have been discussed in a quasi-particle picture. The effective mass of the quasi-particles has been obtained through the self-consistent calculation of the average occupation number of the f electrons. The conditions necessary for the presence of the heavy fermions and the corresponding change of the magnetic properties have been discussed and numerical computation has been carried out. The calculated results have been compared with recent experiments.
THE PLANAR HALL EFFECT AND THE MAGNETORESISTANCE EFFECT IN THE AMORPHOUS SOFT MAGNETIC FILM Fe90-xCoxZr10
Authors: ZHANG WEN-XING  , CHENG XIAN-AN  , WANG XV-WEI  , WANG YIN-JUN  ,   (1)北京航空学院应用数理系; (2)中国科学院物理研究所
Published: November 2020

In this work, the dependence of the planar Hall votage and the magnetoresistance on composition, temperature, and the applied magnetic field has been studied. All the measurements were made by the six probe method. From the results, the planar Hall votage and the magnetoresistance are shown to satisfy the phenomenological formula simultaneously: Vy = p0M2sin2θ and △ρ = cM2cos2θ, and we obtain an equation Vy = cρ2M2sin2θ. Morever, the change of the planar Hall votage of Co90Zr10 and Fe70 Co20Zr10 after their crystallization are just opposite, that is, the above-mentioned value of the Co-rich one increases, but that of the later one decreases.
INLUENCE OF SUBSTITUTION OF TRANSITION ELEMENTS FOR BORON ON THE INDUCED MAGNETIC ANISOTROPY IN COBALT BASE AMORPHOUS ALLOYS
Authors: WANG QUN  , HE KAI-YUAN  ,   东北工学院金属材料系
Published: November 2020

The substitution effect of a few percent of V and Nb for boron in the cobalt base amorphous alloys on the induced magnetic anisotropy has been investigated. Disk shape samples have been subjected to isothermal magnetic annealing in the temperature range 260-320℃. The kinetic curves of formation of induced anisotrpy have been measured with a sensitive torque-magnetometer and the kinetic parameters have been calculated by assuming that the distribution of re-lexation time obeys a log-normal law. These results show that subtitution of vanadium or neobi-um for boron in the cobalt amorphous alloys can reduce the Ku∞ (T) effectively but only have-a very slight effect on the kinetic parameters. The problems of the influences of transition metal additions on the induced magneto anisotropy and stability are discussed.
DIAGONALIZATION OF HAMILTONIAN FOR VIBRATION OF AB ALLOYS
Authors: ZHOU QING  ,   中国科学院化学研究所
Published: November 2020

The crystal theory is formulated for treating the vibrational Green's functions of alloys. The configurations of the alloy could be symmetrized in virtue of the theory of permutation groups. The Hamiltonian of the alloy could be block diagonalized using the franslation group of the lattice, and completely diagonalized by applying Wilson's GF matrix method. So the inverse matrix of Green's functions is solved. Phonon's Hamiltonian and Green's func-tions are also mentioned.
ADSORPTION OF A SELF-AVOIDING WALK ON FRACTAL SPACES
Authors: TANG KUN-FA  , HU JIA-ZHEN  ,   (1)上海交通大学凝聚态物理研究所; (2)上海交通大学应用物理系
Published: November 2020

An exact real space renormalisation group is applied to study the adsorption of a single self-avoiding walk on fractal spaces. Exact results of critical exponent ν and crossover exponent φ show that de Gennes' conjecture φ =1-ν is invalid. The phase diagram has qualitatively the same shape as it has on Euclidean space, except for a unique and important difference that the adsorption transition would take place for a single polymer chain at a hard wail exerting a infinitesimal short-range attractive force on the fractal space instead of a finite one as on Euclidean space.
RESISTIVE STATE OF THE SUPERCONDUCTING GLASS Zr78Co22 IN LONGITUDINAL MAGNETIC FIELDS
Authors: ZHANG QI-RUI  , ZHOU XIAN-YI  , WANG JIN-SONG  , GUAN WEI-YAN  ,   中国科学技术大学物理系
Published: November 2020

When the temperature is far below Tc, a set of electric voltage steps appear on the H-V or I-V curves of the metallic glass Zn78Co22 under longitudinal magnetic fields. The oc-curing conditions and the structural characteristic of steps have been compared systematically with the steps existing in homogeneous superconductors of quasi-one or quasi-two dimension systems. A model of superconducting phase separation and the idea of phase slip centers have been used to explain the observed phenomena.
A KIND OF SPINOR STRUCTURE OF THE POTENTIALS IN BETHE-SALPETER EQUATIONS
Authors: MA GUI-RONG  , ZHANG JIAN-ZU  ,   (1)河北师范学院; (2)山西大学
Published: November 2020

In this paper, we present the general spinor structure of 3-dimensional wave functions of mesons with natural JPC and the system of equations satisfied by 3-dimensional wave functions. They are classified into three classes in the choice of the Spinor structure of potentials which is phenomenologically reasonable, a kind of spinor structure of 3-dimensional wave functions is solved.
PRODUCT OPERATOR FORMALISM FOR SPIN SYSTEMS WITH MAGNETIC EQUIVALENCE
Authors: LIU AI-ZHUO  , PEI FENG-KUI  ,   中国科学院长春应用化学研究所
Published: November 2020

A complete set of symmetry-adapted product operator was introduced to analyse multipulse FT-NMR experiments for spin-1/2 I2S and I3S systems. General cyclic commutation relations exist among the symmetrized product operators. These commutation relations govern the evolution rules of different order coherences under the action of the Hamiltonian in various stage of pulse sequence. The use of symmetry-adapted product operator algebra simplified the analysis of experiments and revealed more evident physical meaning. The procedure was demonstrated by the treatment of DEPT experiment performed on spin-1/2 I2S and l3S systems.
DOPING EFFECT IN a-Si:H/a-SiNx:H SUPERLATTICES
Authors: WANG SHU-LIN  , CHENG RU-GUANG  ,   中国科学院上海硅酸盐研究所
Published: November 2020

A new class of a-Si:H/doped a-SiNx:H superlattices with fixed sublayer thicknesses and NH3/SiH4 ratio, but varying gaseous doping level in a-SiNx:H sublayers, has been sythesized by using equipped shutter deposition system. It is shown that the position of the Fermi level in superlattices can be controlled through doping in a-SiNx:H sublayers, that means that a-Si:H/a-SiNx:H superlattices can be changed from n-type to p-type depending on the B doping level in a-SiNx:H sublayer. However, the trasport property of a-Si:H/a-SiNx:H super-lattices is not affected very much by the P doping in a-SiNx:H sublayers.
ELECTRONIC STATES OF SUBSTITUTIONAL AND INTERSTITIAL GROUP-IB IMPURITIES IN SILICON
Authors: WU JI-AN  ,   中国科学院半导体研究所
Published: November 2020

The single-particle electronic states of group-IB impurities, Cu, Ag and Au, in silicon are calculated by use of the self-consistent field scattered-wave Xα method. The clusters XSi4Si＇12 and XSi10Si＇16, which have been used in some pioneer works and in our earlier successfully treatments of the 4d transition-metal impurities in silicon, are taken to simulate the silicon crystals locally perturbed by substitutional and tetrahedral interstitial group-IB impurities X, respectively. We find that the substitutional impurities introduce a t2 type level in the band gap. This state is by no means (d-lik, but rather mostly dangling bond-like on the silicon neighbors. The interstitial impurities introduce an a1 type level in the gap. In the case of Si:Au, this state is close to the bottom of conduction band and is rather delocalized. In addition, a hyperdeep s-like level just below the bottom of the valence band is obtained. The trends in the electronic properties of group-IB impurities in silicon have been discussed also.
THE COUPLING OF TWO LASER BEAMS IN AN INHOMOGENEOUS PLASMA
Authors: XU ZHI-ZHAN  , YU WEI  , ZHANG WEN-QI  , XU TIE-FENG  ,   (1)宁波大学物理系; (2)中国高等科学技术中心世界实验室; (3)中国科学院上海光学精密机械研究所
Published: November 2020

The coupling coefficient of two laser beams with different frequencies at their resonant point in an inhomogeneous plasma is studied. The effect of this coefficient on plasma beat-wave heating and its dependences on the frequency ratio of the two laser beams and the scale length of plasma are calculated.
LOW TEMPERATURE RESISTIVITY OF METALLIC GLASSES (Cu1-xNix)33 Zr67
Authors: CAO ZHONG-SHENG  , XU MING  , ZHAO ZHONG-XIAN  ,   (1)中国科学院物理研究所; (2)中国科学院物理研究所,中国科学技术大学研究生院
Published: November 2020

Low temperature electrical transport properties of metallic glasses (Cu1-xNix)33Zr67 series has been investigated in the present work. In the wide temperature range of 2-273 K, the resistivity is in accordance with Mooij correlation. The theoretical results in the two level tunnelling model agree with the experimental data (TD) satisfactorily.
THEORETICAL EXPLANATION OF THE CHANGES OF SUPERCONDUCTING CRITICAL TEMPERATURE OF Ba-Y-Cu-O WITH PRESSURES
Authors: FENG SHI-PING  , MA BEN-KUN  ,   (1)北京师范大学物理系; (2)北京师范大学物理系低能核物理研究所
Published: November 2020

Using the Anderson lattice Hamiltonian, We have explained the changes of superconducting critical temperature of Ba-Y-Cu-O with pressures in the framework of electron-electron mechanism which was proposed by the authors.
SURFACE STUDY OF SUPERCONDUCTING Nb-Ge FILM BY AUGER ELECTRON SPECTROSCOPY AND ELECTRON SPECTROSCOPY FOR CHEMICAL ANALYSIS
Authors: GUO YUAN-HENG  , CHEN LAN-FENG  ,   (1)北京大学物理系; (2)北京有色金属研究总院
Published: November 2020

AES and ESCA has been applied to the analysis of the superconducting Nb-Ge film which were deposited onto sapphire substrate by a low-energy sputtering technique. The results of surface analysis and depth profiles showed that there are impurities such as C, O and Al etc. contained in the Nb-Ge film, and O being especially effective impurity which determines Tc. The segregation of Ge at surface has not been found. The concentration retio of Nb/Ge in the film decreased from 3.1 to 2.26 from the surface to the substrate interface. XPS depth profiles showed that the photoelectron spectrum of Nb, Ge, C and O exhibited apparant chemical shifts and variations of the peak shape, i.e. the properties and the chemical states of these elements are complicated and varing along the depth profiles. It may be estimated that Nb probably stabilize the growth of A15 Nb3Ge phase during sputtering deposition.
AN INVESTIGATION ON HYDROGEN EVOLUTION AND IR ABSORPTION OF a-C:H FILMS
Authors: PENG SHAO-QI  , LIU GUO-HONG  ,   中山大学物理系
Published: November 2020

The hydrogen evolution and IR absorption spectroscopy experiments are used to investi-gate the content and configuration of hydrogen in the amorphous carbon films(a-C:H).The results show that: with ilacreasing of the substrate temperature Ts, 1)the configuration of hydrogen in a-C:H changes from a two-phase structure to a single phase structure;2)the hydrogen content in a-C:H decreases monotonically;3)the ratio of sp3 bonds tO sp2 bonds ina-C:H increases monotonically.
PREPARATION AND PHYSICAL PROPERTIES OF INTERCALATION COMPOUND Li1+xV3O8
Authors: WANG GANG  , CAO QI-JUAN  , LI MI-GONG  , DENG QUN-ZHOU  , LI LI-MAN  , GUAN DI-HUA  , LI QUAN  ,   (1)北京钢铁学院,研究生; (2)北京钢铁学院化学系; (3)中国科学院物理研究所
Published: November 2020

The intercalation compound Li1+xV3O8 has been prepared successfully and investigated by X-ray powder diffraction and quantitative element analysis. The compound was also studied with 7Li NMR (on line width) in temperature range 298-400K by using SXP4-100 NMR spectrometer at a frequency f = 35.03 MHz. The active energy of Li+ion, Ea = 0.18eV, is derived from the line width of the motional narrowing. The conductivity is 10-3Ω-1·cm-1 at room temperature.
EXCITED STATES IN COLLISION PROCESS OF DOUBLE CHARGED ION He2+ WITH Ne, Ar ATOM
Authors: LEI ZI-MING  , YANG FENG  , LIU JIA-RUI  , PAN GUANG-YAN  , YU DE-HONG  , SUN XIANG  ,   中国科学院物理研究所
Published: November 2020

The emission spectra in collision process between He2+ and Ne, Ar have been measured using optical methods, by Optical Multichannel Analysis. System. The experimental results demonstrate that there are three channels of excitation in these collision systems: double-electron capture into excited states, single-electron capture into excited states and direct excitation of projectile and target by incident ion impact. Emission cross sections of HeI, HeII, NeI, NeII and ArI, ArII have been obtained from calculations. Some comparisons of emission cross sections between He2++ Ne and He2++Ar have been made.
STABILIZING EFFECTS OF HOT ELECTRONS ON LOW FREQUENCY PLASMA DRIFT WAVES
Authors: HUANG CHAO-SONG  , QIU LI-JIAN  , REN ZHAO-XING  ,   中国科学院等离子体物理研究所
Published: November 2020

The MHD equation is used to study the stabilization of low frequency drift waves driven by density gradient of plasma in a hot electron plasma. The dispersion relation is derived, and the stabilizing effects of hot electrons are discussed. The physical mechanism for hot electron stabilization of the low frequency plasma perturbations is charge uncovering due to the hot electron component, which depends only on a, the ratio of Nb/Nt, but not on the value of βh. The hot electrons can reduce the growth rate of the interchange mode and drift wave driven by the plasma, and suppress the anomalous plasma transport caused by the drift wave. Without including the effect of βh, the stabilization of the interchange mode requires α≈2%, and the stabilization of the drift wave requires α≈40%. The theoretical analyses predict that the drift wave is the most dangerois low frequency instability in the hot electron plasma.
QUANTUM THEORY OF CERENKOV RADIATION IN GAS MEDIUM
Authors: GUO GUANG-CAN  , XIA YUN-JIE  ,   中国科学技术大学物理系
Published: November 2020

A quantum theory of Cerenkov radiation in gas medium is estiblished by means of the first-order perturbation of quantum feild theory. The results show that there are some characteristics different from Cerenkov radiation of liquid and solid. The main features of this Cerenkov radiation are as follows: (1) Line emission, asymmetric profile and small red shift; (2) The radiation angle is independent of frequency and decreases along with increasing of the speed of incident charged particles: (3) No speed threshold of the charged particles exists; (4) No matter whether and atom is at ground state or at excited state, the pro-bility of Cerenkov radiation is identical. The theoretical predictions coincide with the experiments.
LOWER-HYBRID-DRIVEN RADIAL ENERGY TRANSPORT OF RESONANT ELECTRONS
Authors: XIA MENG-FEN  ,   北京大学物理系
Published: November 2020

In lower-hybrid current drive Tokamak, the waves can drive radial energy flux of resonant electrons, which is composed of a directional flux and a conduction-like flux. When the waves are strong enough, the effects of the radial energy flux may be comparable to that of the Coulomb collisions, and the picture of current drive will be changed.
CHAOTIC BEHAVIOURS IN BEND CRYSTAL CHANNEL
Authors: LUO SHI-YU  , SHAO MING-ZHU  , TANG JIAN-NING  , LIU ZHENG-RONG  ,   (1)安徽大学; (2)重庆交通学院
Published: November 2020

The chaotic behaviours of bend crystal channel under the action of periodic field was predicted. The properties of global bifurcation in the system and the condition for occurrence of Smale horseshoes were analyzed, and we showed that the process of approaching chaotic state is the dechanneling process of a particle, and the channeling effect and channeling radiation would exhibit intrinsic stochasticity. The results provided possible theoretical analysis for quantitative discription of channeling effect and channeling radiation.
DIFFRACTION OF ULTRASHORT LASER PULSES
Authors: HAN QUAN-SHENG  , ZHU ZHEN-HE  ,   中央民族学院物理系
Published: November 2020

The energy distribution of the diffraction fields of the transform-limited ultrashort laser pulses is inspected. By calculating the single- and doubleslit diffraction of the transform-limited pulses, the dependence of diffraction patterns on the pulse duration is revealed. It is indicated that the information about the pulse durations and shapes can be obtained through the diffration inspection.
SYMMETRIZATION ANALYSIS OF VIBRATIONAL MODES AND STUDY OF RAMAN SPECTRA FOR MOLECULAR CRYSTAL RbC8H5O4
Authors: HONG SHUI-LI  ,   福州大学物理系
Published: November 2020

Based on the feature of molecular crystal, we apply the theorem that the foctor group of the space group is isomorphic to the point group and combine with the method of structural analysis, to classify the modes of internal vibrations of RbC8H5O4 directly according to the compatibility relations of the irreducible representations. For spectra of the fundamental frequency coupling and Fermi resonance in vibration spectra, we have to make determination according to the space relative position of each functional group and symmetrization of each fundamental direct product representation. Raman scattering spectra of three kind of isomor-phous crystal (i.e, RAP, TAP and KAP) have been obtained and compared with each other. The modes of external vibrations in crystal lattice was then isolated from the overall spectra.
PARTIAL-WAVE ANALYSIS OF 1Se STATES OF HELIUM ATOM AND STRONG RADIAL-ANGULAR CORRELATION REGIONS
Authors: BAO CHENG-GUANG  ,   中山大学
Published: November 2020

The 1Se states of the helium atom have been calculated by diagonalizing the hamiltonian in a model space which is a union of four subspaces. The eigenwavefunctions have been analysed in detail and some features of internal structure have been found.
A NEW METHOD FOR STUDING THE SPECTRAL LINE STRUCTURE
Authors: ZHAO BAO-CHANG  , LI CHUN-FANG  , XUE MING-QIU  ,   中国科学院西安光学精密机械研究所
Published: November 2020

The attempt to reconstruct high resolution spectrum using the interferogram of the Fabry-Perot interferometer has been achieved theoretically by solving an integral equation. But ordinarily, the solution of the equation is unstable. It is necessary to keep the antinoise ability at a level of 10-4 At present, it is very difficult to manufacture such a device, which attains this level. It is demonstrated by using computer simulation experiments that solving of the equation will become rather stable under certain conditions and the antinoise ability can be enhanced to 10-2. This result makes it possible to develop a satisfactory device.
THE NEW LASING OF Rb ATOM IN NOBLE GAS SYSTEM
Authors: LU YI-QUN  , ZHANG BING  ,   中国科学院安徽光学精密机械研究所
Published: November 2020

A new lasing of Rb atom in noble gas system excited by the argon laser (4579 ?) was observed. The lasing originates from the transition between the 5d state and 5p state of Rb atom. The wavelengths are 7760 ? and 762l?.
STUDY OF DOMAIN VOLUME IN POLYURETHANE IONOMER
Authors: YI CHUAN-YUAN  , JIANG CHENG-HUA  , WANG HUA-QIN  ,   (1)河海大学; (2)南京大学物理系; (3)南京大学现代分析中心
Published: November 2020

A sample of polyurethane ionomer is studied by small angle X-ray scattering, positron annihilation and density measurement. The experimental results demonstrate that the counter-ion radius, domain volume and density of polyurethane ionomer increase and free volume decreases with valency of the metal ion increasing. The application ranges of small angle X-ray scattering and positron annihilation are discussed and showed that positron annihilation is one of significant methods for studying domain volume in ionomer.
A NOTE ON THE GROUND STATE OF STRONG ELECTRON-PHONON INTERACTING SYSTEM
Authors: ZHENG HANG  ,   上海交通大学应用物理系
Published: November 2020

In this paper, a new variational ground state of strong electron-phonon interacting system is proposed, in which the electron subsystem is in superconducting pairing state and the phonon subsystem in two -phonon coherent state. We show that such a variational state is necessary for obtaining a superconducting condensation energy with reasonable magnitude and for the effective mass of the charge carriers not being too large.
AN IMPROVEMENT OF KOSSEL RATIO METHOD
Authors: HUANG RONG  , WANG GUAN-YING  ,   中国科学院上海冶金研究所
Published: November 2020

An improvement of revised Kossel ratio method is put forward in this paper, at the same time a Kossel orientation method of crystal is developed. It can analyse more Kossel patterns than generally used ratio method. It is applied to a arbitrarily orientation Kossel pattern of a Fe-0.76wt%V-0.08wt%N alloy. The accuracy of the lattice parameter determination reaches 5×10-5?.
STUDY OF THE THERMAL PROPERTIES FOR SINGLE CRYSTAL OF POLYBIS-(p-TOLUENE SULFONATE) OF 2,4-HEXADIYNE-1, 6-DIOL(PTS)
Authors: DU YING-LEI  , WU BAI-MEI  , HE PING-SHENG  ,   (1)中国科学技术大学基础物理中心; (2)中国科学技术大学物理系; (3)中国科学技术大学应用化学系
Published: November 2020

The thermal properties for PTS are studied by photoacoustic effect in temperature range 175-225 K. It is found that there is a peak of C3K at 200 K (here C3 and K are the specific heat and thermal conductivity of PTS, respectively), which shows crearly the existence of a second order phase transition in view of thermal propertis for the first lime. An anomalous thermal conductivity in the above temperature range is deduced from experiment results.
INTERACTION BETWEEN A CW PLANE WAVE AND A TRAVELLING PLANE PULSE
Authors: QIAN ZU-WEN  ,   中国科学院声学研究所
Published: November 2020

In the investigation of sound interaction between two rectangular plane waves, a deduction has been made by Westervelt that there is no sound scattering by sound outside the region of interaction. However, it seems to be little significance to say that "outside the common region", since its volume is practically infinite. In this paper, the interaction between a cw plane wave and a plane pulse travelling with sound speed is considered. Both of them satisfy the homogeneous wave equation. Outside the common volume they can be employed to study the sound scattering by sound. It is shown in this paper that there is no scattering which follows the law of causality. It is also shown that it appears to be not appropriate to apply Li-ghthill's farfield integral for calculating sound scattering by sound in this case.
1 DIMENSIONAL NMR HOMONUCLEAR CORRELATION EDITING
Authors: YAO SHENG-GEN  , CHEN JUN  , HUANG YONG-REN  ,   华东师范大学物理系
Published: November 2020

The "hard" pulse sequences with spin echo for one dimensional homonuclear correlation editing (1 D HCE) are discussed with density operator theory. The experimental results coincides with the theoretical expectation. It is shown that the correlation obtained from I D HCE spectra is similar to that from COSY. The advantages of this technique are: 1) saving time, 2) saving computor memory, 3) keeping the sensitivity, resolution and the fine structure of 1 D NMR spectra.
WEAK LOCALIZATION AND INTERACTION EFFECTS IN THE LOW TEMPERATURE RESISTIVITY AND MAGNETORESISTANCE OF DISORDERED Cu33Y67
Authors: LI YAN-FEI  ,   哈尔滨科学技术大学技术物理系
Published: November 2020

The electrical resistivity and magnetoresistance of amorphous Cu33Y67 alloy has been measured. The alloy was prepared by melt-spinning in He gas. Interaction effect can provide a good quantitative explanation for the temperature depen-dence of the electrical resistivity at low temperatures with a main contribution of the form of T1/2 below 4.5 K. Its variation at higher temperatures can also be explained by a combination of interaction and weak localization effects. The magnetoresistance measurements up to 1.8 Tesla reveals predominant localization effects with a strong influence of the spin-orbit scattering. The data are rather larger than that predicted by weak localization. An overall good fit is obtained if one increases the theoretically predicted strength of localization by 3 times. One fitting parameter, spin-orbit scattering time τ50, is unchanged, while inelastic scattering time τi's used fitting to two set of the data of resistivity and magnetoresistance are close to each other.
STUDY ON OPTICAL TRANSFORMATION IN HIGH SEQUENCE
Authors: CHEN YAN-SONG  , ZHENG SHI-HAI  , LI DE-HUA  ,   中国科学院物理研究所
Published: November 2020

There is some trouble in experimental study of optical transformation developing from low- to high-sequence. In this paper, to solve these problems, a five-plane coherent system is proposed. As an example, a three-plane and a five-plane experimental systems have been established to realize the 1-dimensional 32-sequence Walsh transformation. The experimental results are in agreement with the theoretical expectations.
MICROCRYSTALLOGRAPHICAL PROCESS OF RADIATION DAMAGE IN Hg1-xCdx Te
Authors: SONG XIANG-YUN  , WEN SHU-LIN  ,   中国科学院上海硅酸盐研究所
Published: November 2020

The process of the lattice damage and its development in the Hg1-xCdxTe crystal under electron irradiation with high dose and high energy have been studied at lattice level by high resolution electron microscopies. The results indicate that Hg1-x CdxTe lattice damage was caused by the deformation of the [(Hg, Cd)Te4] tetrahedra due to the strong electron irradiation. These deformations could be seen on the {111} plane and they developed along the {111} plane as steps. Moreover, a new superlattice with larger parameter of unit-cell was observed along the [110] direction.
A ARUPS INVESTIGATION OF TWO SURFACE SUPERSTRU-CTURES (4×1)-O AND (2×2)-S ON VANADIUM(001) SURFACES
Authors: XU ZHANG-LONG  , LIU GU  , JI ZHEN-GUO  , ZHOU XIAO-XIA  ,   (1)浙江大学物理系; (2)浙江大学物理系,上海交通大学应用物理系86级博士生; (3)浙江大学中心实验室
Published: November 2020

Two surface superstructures (4×1)-O and (2×2)-S, induced respectively by oxygen and sulphur segregation on the V(001) surface, are studied in detail by ARVPS. The energy levels and symmetry of the adsorbate surface states derived from S- and O-ordered adsorbate over-layers are determined. Experimental evidence shows that the adsorption sites of oxygen on V(001) surface are four-fold hollow sites. All the experimental results consist with theoretical calculations, and are similar to that for oxygen on Ni(001) and Cr(001) surfaces.
SU(10) CHIRAL GRAND UNIFIED PREON MODEL
Authors: BAO SHU-QING  , XUE XIAO-ZHOU  ,   河南师范大学物理系
Published: November 2020

We have discussed SU(N) chiral grand unified preon models under some constraints assumed in the paper And we have constructed SU(10) chiral grand unified preon model in detail. Five families exist without exotics.
CALCULATION OF MAGNETIC SINGLE-ION ANISOTROPY AND THE MORIN TRANSITION IN HEMATITE
Authors: LI HUA  , JIANG SHOU-TING  , MEI LIANG-MO  , GUO YI-CHENG  , YANG GUEI-LIN  , XU YOU  , ZHAI HONG-RU  ,   (1)南京大学物理系; (2)山东大学物理系
Published: November 2020

A calculation of magnetic single-ion anisotropy in hematite (α-Fe2O3) has been made, based on point-charge model in crystalline field. The nearest-neighbor O2- ions and the nexi-nearest-neighbor Fe3+ ions were chosen as ligands and the effect of electrostatic shield provided by the O2- ions was taken into account. Considering the sixth order perturbation, we ob-tained an equivalent single-ion anisotropy field Hsi=102.3×102 Oe. Making use of this results in conjunction with the computed equivalent dipolar anisotropy field by Artmen et al,. the Morin transition temperature in hematite TM=261 K was obtained, which is in good agreement with the experimental value. Based on the linear approximation principle, we got the TM-n relation for low n value in α-(Fe-1nAln)2O3. With this relation the dependence of the-Morin transition temperature, TM, on n in low n value range could be explained quite well.
RESEARCH ON PERFORMANCE OF LONG-PULSEWIDTH PULSED Nd:YAG LASER
Authors: YE BI-QING  , MA ZHONG-LIN  , WANG MING-QI  ,   中国科学院上海光学精密机械研究所
Published: November 2020

We have developed a several-millisecond pulsewidth pulsed Nd:YAG laser with output power of 200 watts in average and 5000 watts in peak. The performance of the long-pulse-width pulsed Nd:YAG laser is investigated. The theoretical analysis agrees with the experiments quite will.
EXAFS, IR AND RAMAN SPECTRA STUDIES ON THE NONCRYSTALLINE COPPER IONIC CONDUCTORS IN P2O5-CuI-CuCl SYSTEM
Authors: CUI WAN-QIU  , ZHOU JING  ,   武汉工业大学硅酸盐材料科学和工程学
Published: November 2020

Microstructures of the noncrystalline copper ionic conductors with the network former of P2O5 were studied by means of transverse EXAFS, IR and Raman spectra. From the results, it is derived that in these noncrystalline network structure, there are skeleton structure elements such as [PO4]3-, [CuO4]-6, [CuO3I]5-, [PO31]2- etc., and there are two different distributions for Cu+ ions in voids of the network. The second-order phase transition of the materials at about 50℃ and conduction properties of Cu+ ions are discussed.
A CRITERION FOR NON-CLASSICAL STATE OF LIGHT
Authors: YAO DE-MIN  , GUO GUANG-CAN  ,   (1)中国科学技术大学基础物理中心; (2)中国科学技术大学物理系
Published: November 2020

A general criterion for non-classical state of light is given, by which two kinds of non-classical single-mode states (antibunching and squeezing) are discussed in detail.
KINETICS OF THE CAPTURING FROM THE FREE MAJORITY CARRIER TAIL REGION AND MEASUREMENT OF THE MAJORITY CARRIER CAPTURE CROSS SECTION
Authors: FU CHUN-YIN  , LU YONG-LING  , ZENG SHU-RONG  ,   北京大学物理系
Published: November 2020

We have discussed the kinetics of the capturing of freemajority tail by deep centres in semeconductors. We pointout that, the DLTS' signal is dicrectly proportional to the pulse width, if the DLTS' response region is restricted in the end of free-carrier tail vegion.This phenomenon may be used to measure the majority carrier capture cross section, in which the net shallow impurity concentration and the majority carrier capture cross section are both relatively wigh.
DEPENDENCE OF THE SUPERCONDUCTING Tc UPON THE ATOM MASS IN AMORPHOUS SUPERCONDUCTORS
Authors: CAO XIAO-WEN  ,   中国科学院等离子体物理研究所
Published: November 2020

The correlation between the superconducting Tc and the atom mass (M) for amorphous superconductors has been studied. It is found that the superconducting Tc is inversely proportional to the cubic root of the atom mass, i.e. Tc∞1/M1/3 for the elements of the same group in which they have the same number of valence electrons. The Tc of crystalline superconductors are discussed too, including the superionductivity of high Tc oxide superconductors.
THE LOCALIZED VIBRATIONAL MODES OF ONE-DIMENSIONAL POLARON
Authors: XING BIAO  , SUN XIN  ,   (1)复旦大学物理系,华中工学院物理系; (2)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
Published: November 2020

The lattice vibrations of polaron in one-dimensional electronlattice coupled system are investigated. Two new localized vibrational modes g6 and g′6 are found, they can exist in some ranges of coupling constant λ. Furthermore, the dependences of frequencies and configurations of various localized modes on λ have been figured out.
THE CHARGE DENSITY OF FRACTIONAL QUANTIZED HALL REGIME
Authors: XIONG XIAO-MING  , ZHOU SHI-XUN  ,   复旦大学物理系
Published: November 2020

The charge density of the local charge neutrality two dimensional electron system has been obtained for 1/3 Landan filling factor by the self consistent iteration method. We find a characteristic density distribution for the downward cusps of the ground state energies.
A STUDY ON IMPEDANCE SPECTROSCOPY OF NON-CRYSTALLINE IONIC CONDUCTORS
Authors: CUI WAN-QIU  , YIN JIAN  , ZHOU JING  , HE ZOU-RAN  ,   武汉工业大学
Published: November 2020

The impedance spectroscopy of non-crystalline ionic Conductors in systems of P2O5-Li2O-LiCl-Al2O3, P2O5-Cul-CuCl, GeO2-Ta2O5-Li2O are studied. The models of equivalent circuit for impedance spectroscopy measurement box of non-crystalline specimen is presented, and the dispersion relations for boundery impedance are obtained under certain conditions, the boundary impedance presented here will transit to the constant phase angle impedance.
THE MULTI-PHOTON QUANTUM STATISTICAL THEORY OF DRIVEN OPTICAL SYSTEMS (Ⅰ)——FOKKER-PLANCK EQUATION AND GOOD CAVITY CASE
Authors: LIN REN-MING  , HUANG SI-XIAN  , ZHANG LIN  ,   福建师范大学物理系
Published: November 2020

The systematic method of Fokker-Planck equation (FPE) for the generalized Wigner distribution is used to study the multi-photon transition process of a driven optical system. The general multi-photon FPE, the state equation and the spectrum of transmitted light in good cavity limit are obtained- The two-photon optical bistability spectrum of transmitted light is calculated and compared with single-photon case. It is shown that for multi-photon case, the atom -atom correlation is also negligible in the good cavity limit.
SURFACE VIBRATION MODES OF Si(111)
Authors: JIANG ZUI-MIN  , WU ZI-QIN  ,   中国科学技术大学基础物理中心
Published: November 2020

In this paper, the atomic vibration modes of Si(lll) planar strcture with different layers have been calculated using the dynamic matrix method. The Raman frenquency shift, which moves to lower wave number greatly for microcrystals compared with single crystals, can be explained by the activation of surface modes. By hybridized orbical theroy, the change of surface force constants was obtained. The calculated frequency of surface modes, 469cm-1, is close to the experimental result 430 cm-1 first reported by Okada.