bluuebunny/crossref_metadata_2025 huggingface dataset:
ANALYTIC SOLUTION OF HYDROMAGNETIC FLOW DUE TO A ROTATING DISK AND CALCULATION OF EFFECTIVE SEGREGATION COEFFICIENT Keff OF SOLUTE IN SILICON MELT
Authors: MAI ZHEN-HONG  , MAO ZAI-XIAN  , YANG SHU-LIN  ,   (1)北京应用物理与计算数学研究所,北京,100088; (2)中国科学院物理研究所,北京,100080
Published: November 2020

Based on the analytic solution of hydromagnetic flow due to a rotrating disk, both velocity field and effective segregation coefficient Keff of solute in silicon melt in terms of one dimensional model were calculated under actions of various axial magnetic field strength. Results of computer simulation are presented graphically. It is found that not only the magnitudes of velocity components are strongly suppressed by magnetic field, but also the Keff of solute increases as the magnetic field increases with given rotational rate, finally tends to a constant within some definite regions of magnetic field. In addition, it is also found that the Keff is strongly dependent on the diffusion coefficient of solute.
ELECTRON CORRELATION AND SOLITON
Authors: XIE SHI-JIE  , MEI LIANG-MO  , SUN XIN  ,   (1)复旦大学物理系,上海,200433;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; (2)山东大学物理系,济南,250100
Published: November 2020

The electron correlation and soliton in polyacetylene have been studied with the CBF method. By considering the complete electron-electron interaction, we concluded that the stable static configuration of a PA chain with odd atoms and a single electric charge is a soliton. With the increase of e-e interaction strength U and interaction range α/β the localization of soliton is enhanced, and the soliton creation energy is reduced, so although the e-e interaction is considered, the conclusion that soliton is main charged carrier in high conducting polymers is still tenable.
ELECTRONIC STRUCTURES OF RYDBERG STATES FOR MOLECULES WITH Ne AS THEIR UNITED ATOMS
Authors: YANG HUAN-WANG  , LIU LEI  , LI JIA-MING  ,   (1)山东师范大学物理系,济南,250014; (2)中国科学院物理研究所,北京,100080
Published: November 2020

Based on the multiple-scattering self-consistent-field theory, we have studied the molecular Rydberg states of the molecules B2,HF,H2O,NH3 and CH4 with Ne as their united atoms. From the united atomic limite of molecular electronic configuration, we set a convention to determine the principal quantum number of fhe initial states of a Rydberg series. The dynamics of the excited molecules are elucidated. The theoretical calculations are in fair agreement with the available experimental results.
ELECTRO-OPTIC EFFECT IN PESO ACOUSTO-OPTIC MODULATOR
Authors: TAI REN-ZHONO  , LU FU-YUN  , YUAN SHU-ZHONG  , GUAN XIN-AN  , LI BING  ,   南开大学现代光学研究所,天津300071
Published: November 2020

With the theory of one-dimensional approximation, combined with the boundary conditions, an inhomogeneous electric field is derived from the foundamental equations of pieozoelec-tric effect. This inhomogeneous electric field will lead to generation of "electric grating", and "high-order grating" can also appear owing to coupling between "electric grating" and "acoustic grating". Linear electro-optic effect in PESO modulator is helpful to the diffraction and modulation of the incident light beam. The experimental results verify our conclusions.
PHOTO-INDUCED ABSORPTION BAND IN QUASI-ONE-DIMENSIONAL HALOGEN-BRIDGED MIXED-VALENCE PLATINUM COMPLEXES
Authors: PENG JING-CUI  ,   湖南大学应用物理系,长沙410082;中国高等科学技术中心(世界实验室)北京100080
Published: November 2020

Photo-induced absorption states in quasi-one-dimensional halogen-bridged mixed valence platinum complex is investigated. Based on the experimental data, a mechanism for photo-induced absorption is presented. Photo-induced absorption spectra both deformations of alternative and polaron induced for halogen ions are calculated. The comparison with experiments is made.
A STUDY OF SULFIDE TREATED InSb(111) SURFACES
Authors: DONG GUO-SHENG  , LU CHUN-MING  , LI ZHE-SHEN  , WANG XUN  ,   复旦大学应用表面物理国家重点实验室,上海200433
Published: November 2020

Auger electron spectroscopy (AES), X-ray photoelectron spectroscop (XPS) and ultraviolet photoelectron spectroscopy (UPS) have been used to study the InSb(lll) surfaces treated with (NH4)O2Sx. It is found that after the sulfide treatment, the sample surfaces are covered by a thin overlayer of sulfide (8?), which prevents the sample surface from oxidization and carbon contamination in the air. XPS and UPS results show that S atoms bond to both Sb atoms and In atoms on the sample surfaces. Sb-S bonding peaks in the Sb3d spectra exhibit a core level shift of 1.9eV, the bonding of S to In atoms causes an In4d core level shift of 0.6-0.7eV. A thermal annealing at 350℃ gives rise to the decomposition of Sb-S bonding and the evaporation Sb atoms from the sample surfaces. In-S bonding can not be decomposed completely by annealing up to 500℃ and a small amount of S atoms remains on the sample surfaces in the form of indium sulfide.
A SIMPLE ALGEBRAIC APPROACH TO THE SECOND QUANTIZATION REPRESENTATION
Authors: LI BO-ZANG  , WU JIAN-HUA  ,   中国科学院物理研究所,北京100080
Published: November 2020

In this work, a simple algebraic approach to the second quantization representation (SQR) for systems of many /identical particles is developed. In comparison with the traditional method, our method is simpler and elementary in mathematical operation, as well as is more transparent in exploring the mathematical structure and physical meaning of wave functions and mechanical quantities in SQR.
A STUDY ON THE ANISOTROPY OF COBALT-SURFACE-MODIFIED γ-Fe2O3 PARTICLES
Authors: ZHANG LIN  ,   山东大学物理系,济南250100
Published: November 2020

The coercivity of cobalt-surface-modified γ-Fe2O3 particles is 8000 to 32000 A/m greater than that of the original γ-Fe2O3. The origins of uniaxial anisotropy and the mechanisms of the increase of coercivity of Co-γ-Fe2O3 and CoFe-γ-Fe2O3 particles are studied in this paper. The directional order (preferred orientation) of the cobalt ions appears on the surface of γ-Fe2O3, raises the surface uniaxial anisotropy and thus increases the coercivity of Co-γ-Fe2O3. The squareness ratios of various samples of CoFe-γ-Fe2O3 (Co/γ-Fe2O3 = 2 -16wt%) are obtaihed to be about 0.5. The coercivity of CoFe-γ-Fe2O3 is increased by the uniaxial anisotropy and multiaxial magnetocrystalline anisotropy strengthened after CoFe-coating. The origins of uniaxial anisotropy strengthened are suggested. The first is that directional order (preferred orientation) of cobalt ions on the surface of γ-Fe2O3 results in surface uniaxial anisotropy. The second is that the uniaxial anisotropy results from preferred alignment of preferred axis of cobalt ferrite microcrystal in surface layer of γ-Fe2O3.
A STUDY ON FUNDAMENTAL AND HIGHER ORDER LINEAR RAMAN SCATTERING OF AGGREGATED MOLECULE
Authors: PAN DUO-HAI  , HUAN YI-XIAN  , FU KE-DE  , ZHANG PENG-XIANG  ,   (1)陕西师范大学物理系,西安710062; (2)中国科学院物理研究所,北京100080
Published: November 2020

Fundamental and higher order linear Raman scattering of J-aggregated 2,2′-cyanine adsorbed on the silver colloid has been analyzed on the basis of its concentration dependence. The results indicate that there exists only one kind of stable a-dsorbed J-aggregate structure. Some of the low-frequency bands in Raman spectrum are mainly due to J-aggregated molecule, which also plays an important role in the enhancement of higher order linear Raman scattering.
CORRELATION BETWEEN THE IRREVERSIBILITY LINE AND PINNING POTENTIAL IN HIGH-Tc SUPERCONDUCTOR YBa2Cu3O7-δ
Authors: JIN XIN  , ZHANG YI-TONG  , LU RUI-XI  , YAO XI-XIAN  , LIU FENG-SHENG  , MOU HUI-LIN  , WU XIAO-ZU  , ZHOU LIAN  ,   (1)南京大学物理系,固体微结构物理国家实验室,南京,210008; (2)西北有色金属研究院,宝鸡,721014
Published: November 2020

We have studied the irreversibility line and pinning potential U0 of high-Tc melt-textured YBa2Cu3O7-δ samples and found that the irreversibility line takes an exponential form B*-e(-T/Tc) over the temperature range of 72-85K, whereas the corresponding magnetic measurement at 77K gave a nonvanishing critical current density It is shown in the present paper that the functional expression of irreversibility line and pinning potential U0 of samples are closely associated.
A STUDY ON THE DISTANCE OF Cr-O IN COMPLEX IONS (CrO4)
Authors: ZHU SHENG-XIANG  , YANG BAO-CHENG  , LIN YUAN-QI  , PAN PHI-CONG  , ZHU JI-KANG  ,   (1)华东师范大学物理系,上海200062; (2)上海软件开发中心,上海200031; (3)同济大学物理系,上海200092; (4)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, the electronic structures and energy levels of the complex ion (CrO4) as Cr-O distance changes are analyzed with the spin-polarized MS-Xα method, Under the symmetry Td the one-electron energy levels and eignfunctions, electronic configuration of ground state, optical transitions of lower excited state,and schematic diagram of the energy levels of the three complex ions,(CrO4)6-,(CrO4)5- and (CrO4)4-, are given, When the distance of ligands from the central ion is sma. ller than 2?(R≤2?), the results given by crystal field theory is not satisfactory. In this case, the influence of the distance of ligands from the central ion and the influence of the 4s or 4p atomic orbits in the central ion(transition metal ions to be considered must be taken into aceount.
SPECTRUM CHARACTERISTICS OF AN ATOM IN A STRONG MAGNETIC FIELD
Authors: HE XING-HONG  , ZHOU FENG-QING  , LI BAI-WEN  , ZHANG CHENG-XIU  ,   (1)中国科学院武汉物理研究所波谱与原子分子物理开放研究实验室,武汉430071; (2)中国科学院武汉物理研究所波谱与原子分子物理开放研究实验室,武汉430071;华中理工大学激光技术国家实验室,武汉430074
Published: November 2020

A perturbation method is used to evaluate the energy levels and oscillator strengths of sodium atoms (m=-2,π2=+)in a strong magnetic field. The main features of the calculated spectra which lie in the strong-field-mixing regime agree well with the corresponding experimental results. Besides the conventional quasi-Landau resonance with spacing equal to 1.5?ωc (ωc is the electron cyclotron frequency) near the zero field ionization limit, a series of resonance spacings are found and analysed using the zero order energy formula and the Fourier transform technique. The values of these spacings are in consistent with other theoretical results. Based on the perturbation method, a quantum mechanical explanation for the spacings is given. These resonance spacings are independent of the applied exernal magnetic field.
SQUEEZING PROPERTIES OF EIGENSTATES OF HIGH ORDER POWER OF PHOTON ANNIHILATION OPERATOR
Authors: ZHAN YOU-BANG  ,   淮阴师范专科学校物理系,淮阴223001
Published: November 2020

In this paper, the squeezing properties of orthonormal eigenstates of high order power of photon annihilation operator αk (k≥3) are studied. It is shown that the amplitude Nth-power squeezing (k=2N) can exist in the eigenstates when k is even.
ION COORDINATION AND STRUCTURAL TRANSITION OF YBa2Cu3-xFexOy
Authors: LIN MING-XI  , CHEN GUAN-MIAN  , A SHA  , XU XIAO-ZHEN  ,   (1)中国科学院物理研究所,北京,100080; (2)中央民族学院,北京,100081
Published: November 2020

Critical temperature, phase structure, oxygen content and coordination of oxygen atoms were studied for Fe doped superconducting oxides YBa2Cu3-xFexOy(0.01≤x≤ 0.2) after an-nealing at different temperatures by use of M?ssbauer spectroscopy and X-ray diffraction. The result shows that Fe ion occupies mainly Cu(l) position. Both the increase of Fe content and vacuum annealing at high temperature lead to the structural transition from orthorhombic, to tetragonal phase, and the critical temperature Tc goes to zero. However, in the former case, during the increase of Fe content the transition occurs when appreciable amount of Fe3+ ion with sixfold coordinate oxygen atoms exists, and is thus accompanied by the increase of oxygen content. But for vacuum annealing at high temperature, with the increase of annealing temperature the number of Fe ion with double oxygen coordination increases and oxygen content decreases, and the transition occurs when this double oxygen coordination dominates. Both these processes destroy the planar Cu-O configuration and lead to the decrease of Tc .Besides, the valence states of Fe atoms at different lattice sites are also determined and discussed.
SPECTRAL PROPERTIES OF THE GENERALIZED FIBONACCI QUASIPERIODIC CHAINS
Authors: FU XIU-JUN  , GUO ZI-ZHENG  , ZHOU PEI-QIN  , LIU YOU-YAN  ,   (1)华南理工大学应用物理系,广州510641; (2)内蒙古师范大学物理系,呼和浩特010022
Published: November 2020

This paper is devoted to the study of electronic and phonon spectra of a kind of generalized Fibonacci quasiperiodic chain (Twins model). Renormalization group results show that the electronic spectrum has a trifurcating selfs milar structure but the middle subbends in every hierarchy are similar to spetral structure of the periodic systems. The analysis is confirmed by numerical results. While the phoson spectrum shows the same spectral structure as that of the Fibonacci chain.
INFRARED REFLECTION SPECTRA OF Y1-xPrxBa2Cu3O7+δ
Authors: YE HONG-JUAN  , RAN ZHONG-YUAN  , HU CAN-MING  , TIAN SHI-YING  , LIU JING-QING  , HUANG YE-XIAO  , ZHAO ZHONG-XIAN  ,   (1)中国科学院红外物理国家重点实验室,上海200083; (2)中国科学院物理研究所,北京100080
Published: November 2020

The infrared refleotion spectra of Y1-xPrxBa2Cu3O7+δ(x = 0,0.1,0.2,0.4,0.5, 0.6, 1.0) are measured in the temprature range of 4.2 to 300K. The measurements show that Ba mode has double mode behavior, the strength of which inverses with increasing x, and that the position of the reflection peak at 194cm-1, which has been identified as Y mode of YBa2Cu3O7+δ, is indenpendent of the density of Pr, i. e, the position of the peak does not change whether the Y is partially or totally substitued by Pr. This indicates that in Y1-xPrxBa2Cu3O7+δ the valence of Pr is tetra-valent. The substitution of Pr make the mobile holes localize around Pr, thereby lead to the suppression of superconductivity.
A STUDY OF Nb(Ba) ENHANCEMENT 2223 PHASE FORMATION IN Bi-BASED SUPERCONDUCTORS
Authors: LI YAN-RONG  , LI YOU-MO  ,   中国科学院长春应用化学研究所,长春130022
Published: November 2020

Properties of a series of superconducting compounds of nominal composition (Bi2-x,Nbx)Sr2Ca2(Cu3-yNby)Ox(x=0-1.0, y=0-1.0) have been investigated using electrical resistivity, a.c magnetic susceptibility and X-ray powder diffraction measurements. When x =0.2-0.3 or y=0.2, 2223 phase (Tc～110K) in samples is significantly enhanced. The added Nb in the sample with Bi1.7Nb0.3Sr2Ca2Cu3Oy has obvious effect of promoting 2223 phase. When furthermore doping Ba as replacing Sr in BiNbSrCaCuO, it is observed that double-doped Nb-Ba has more evident enhancing the high-Tc phase formation than single-doping Nb. The doped Nb-Ba in sample with nominal composition Bi1.7Nb0.3Sr1.8Ba0.2Ca2Cu3Oy is distinctly favour to formation of 2223 phase. From TGA experiment, the weight of sample doping Nb(Ba) at ～600℃ begin to increase by absorbing oxygen. By XPS of O1s in sample doped with Nb(Ba), the shoulder peak at ～529eV is more evident except for ～531eV as main peak.
METAL-INSULATOR TRANSITION IN YBa2Cu3O7-x
Authors: YANG YONG-HONG  , XING DING-YU  , GONG CHANG-DE  ,   南京大学物理系,理论物理中心,南京,210008
Published: November 2020

On the basis of the scalinp: theory of locallzation, we introduce an effective dimensionality for layered structure systems, which depends on the conductivity anisotropy or the interlayer coupling. We propose that both decrease of conductance and drop in effective dimensionality account for the metal-insulator transitions in YBa2Cu3O7-x and other oxide compounds. The scaling theory in finite temperatures is also discussed to explain the temperature dependence of the normal state resistivities.
STABILITY OF GROUND STATE AND CONDENSED PHASES IN INFINITE POLYACENACENE
Authors: HU CHENG-ZHENG  ,   武汉大学物理系,武汉430072
Published: November 2020

The normal ground state stability of infinite polyacenacene is investigated by means of the method of quantum field theory in statistical physics. The condensed phases such as charge density wave (CDW), spin density wave (SDV) and superconducting phases are predicted within the random phase approximation (RPA). In particular, we show that there is a possibility that polyacenacene could be a high temperature superconductor.
INFLUENCE OF KCl ON THE ORIENTATION OF ADSORBED MOLECULE IN SERS SYSTEM
Authors: MIAO RUN-CAI  , FU KE-DE  , HUAN YI-XIAN  , LIU XI-SHE  ,   陕西师范大学物理系,西安710062
Published: November 2020

The variation of surface enhanced Raman scattering was observed as a small amount of KCl was added in SERS system and the intensity ratio of characteristic Raman peaks was detected for two kinds of molecules. In addition the change of orientation of adsorbed molecule on the silver surface was also analysed.
TIME-DEPENDENT SOLUTION OF THE FOKKER-PLANCK EQUATION OF NONLINEAR NONPOTENTIAL SYSTEMS
Authors: QU ZHI-LIN  , HU GANG  ,   (1)北京师范大学物理系,北京100875; (2)北京师范大学物理系,北京100875;中国高等科学技术中心(世界实验室)理论物理分中心,北京100080
Published: November 2020

The time-dependent problem of Fokker-Planck equation of the nonlinear systems without detailed balance is solved in the weak noise limit by using the Ω-expansion of the Green function. We further reveal the possibility of the dimension reduction and some scaling relations in the relaxation of the system from the unstable state to the stable state.
A FREE-ELECTRON LASERS PUMPED BY SOLITON LASER
Authors: ZHANG YI-BO  , JIANG HUA-BEI  ,   (1)Center jor Research in Electro-Optics and Lasers (CREOL),University of Central Florida,Orlando,FL32816 U.S.A.;成都科技大学物理系,成都610065; (2)东南大学电子工程系,南京210018
Published: November 2020

We propose a scheme of building a free-electron laser in the soft X-ray region pumped by the soliton laser. Making use of soliton laser wave evolution shape and single-pass small signal analysis, we find that this laser has two special advantages over the previous electromagnetic wave undulator free-electron lasers namely, (1) a very small "mass-shift effect" because of the special characteristics of soliton lasers, (2) an additional "frequency tuning effect" based on the conventional free-electron laser's tuning ability. We also obtain the small signal gain and carry out some discussion.
THEORETICAL CALCULATION OF SHG COEFFICIENTS OF Na2SbF5 CRYSTAL
Authors: WU KE-CHEN  , CHEN CHUANG-TIAN  ,   中国科学院福建物质结构研究所,福州350002
Published: November 2020

The anionic group theory for nonlinear optical crystal has been applied to calculate SHG coefficients of Na2SbF5 crystal. The calculated dm is 4.48×10-10 esu, which agrees well with the experimental value. The theoretical results indicated an important fact that the major part of SHG coefficient is determined by the lone pair orbital of anionic group (SbF5)2-. Moreover, through analyzing the location of lone pair energy level, the reason why Na2SbF5 crystal has so small second-order susceptibility has been explained.
A STUDY ON CHARACTERISTICS OF THE VACANCY COMPLEX IN Fe-V-N DILUTE ALLOY (I)
Authors: WANG XIAO-GANG  , ZHANG HONG  ,   (1)中国科学院上海冶金研究所,上海200050; (2)中国科学院上海冶金研究所,上海200050;湖南师范大学物理系,长沙410006
Published: November 2020

The vanadium-nitrogen-vacancy complexes appearing in the dilute Fe-V alloys doped with nitrogen have been studied using positron annihilation technique. The positron lifetime and formation enthalpy of the complex were estimated. The results provide an experimental evidence to explain the enhanced diffusion of vanadium in dilute Fe-V-N alloys.
ELASTIC FIELDS IN THE REGION NEAR AN INTERFACE IN THE CRYSTAL ANISOTROPIC THEORY
Authors: YANG SHUN-HUA  , LI GUO-WANG  , ZHANG YU  ,   (1)北京科技大学材料物理系,北京100083; (2)北京科技大学物理系,北京100083
Published: November 2020

According to the recent studies on interfaces in crystals, it is evident that most grain boundaries and phase boundaries have two dimensional periodic structures. Starting from this fact, using the representation of Fourier series expansion, in the case of given interface structure, i.e., in mathematical sense, formerly given the boundary condition, the elastic fields near the phase boundary between two anisotropic phases are found. As an example, we compute numerically the field of a twist grain boundary in Ni. The method and equations presented in this paper are generally applicable for studying various types of grain boundaries and phase boundaries, providing an effective and concise method for treating this kind of problem.
A STUDY OF ZINC DIFFUSION IN ION-IMPLANTED POLYCRY-STALLINE ALUMINIUM
Authors: ZHANG JIAN-HUA  , LIU ZENG-SHAN  , QIN YONG-ZHI  ,   (1)西安石油学院基础课部,西安710061; (2)西北工业大学应用物理系,西安710072
Published: November 2020

Zn-Al diffution couples were formed by ion implantation. The diffusion model of impurity atoms in single-phase region was suggested for the case that the implanted concentration was less than its solid solubility in host. Zn diffusion profiles calculated from this model with numerical method were in good agreement with the results of experiment. By the enhanced diffusion effect accompanied with ion implantation, the diffusion coefficients of Zn in polycrystalline Al between 260-380℃ were obtained, which were difficult to determine using conventional deposition method.
MAGNETIC PROPERTIES OF ULTRAFINE NICKEL PARTICLES
Authors: DU YOU-WEI  , XU MINO-XIANG  , WU JIAN  , SHI YING-BING  , LU HUAI-XIAN  , XUE RONG-HUA  ,   (1)南京大学固体微结构物理国家实验室,南京,210008; (2)南京大学固体微结构物理国家实验室,南京,210008;浙江大学材料系,杭州,310027; (3)南京大学物理系,南京,210008
Published: November 2020

In this paper we report the magnetic properties of ultrafine Ni particles. The specific magnetic moment drastically decreases with reducing the diameter d of particles when d≤15 nm. The coercivity Hc also approaches zero when d is about 15nm. The value of effective magnetic anisotropy constant is determined as K=-5.8×105 (erg/c.c.). It is found to be larger than the bulk one. The mechanism of reversal magnetization can be understood by sphere chain model. Curie temperature Tc is obviously lower for 9nm average diameter particles as compared with the bulk, this may result from the lattice contraction.
THEORETICAL STUDIES ON RESONANT TUNNELING IN MULTI-BARRIER STRUCTURES
Authors: XU HUAI-ZHE  , WANG YIN-YUE  , ZHANG FANG-QING  , CHEN GUANG-HUA  ,   兰州大学物理系,兰州730001
Published: November 2020

Resonant tunneling in rectangular multi-barrier structures are studied theoretically. Analytical expressions of the transmission coefficient and the resonance condition are strictly derived. It is found that the resonance energies are different from the eigenvalues in the quantum well due to coupling between wells in the multi-barrier structures. The resonance condition corresponds to the energy range of the physically possible wave functions in the Kronig-Penney model. It is confirmed that the transmission spectrum is a Lorentzian nearby energies of resonance. We believe that the expression are useful for evaluating the energy variations of transmission coefficient and estimating the resonance energy, and also useful in fabrication of resonant tunneling devices.
EFFECT OF HEAT TREATMENT IN H2 ATMOSPHERE ON Bi2Sr2CaCu2O8+δ
Authors: FANG MING-HU  , ZHANG XUAN-JIA  , XU ZHU-AN  , SHEN MIN  , ZHANG QI-RUI  , WU YU-MING  , WANG QI-DONG  , TANG XIAO-MING  ,   (1)浙江大学材料科学与工程系; (2)浙江大学分析测试中心; (3)浙江大学物理系,杭州310027
Published: November 2020

The X-ray powder diffraction, properties of normal state and superconducting state (especially carrier concentration) measurements were carried out for the high quality and single phase polycrystal Bi2Sr2CaCu2O8+δ samples annealed in low vacuum or H2 atmosphere at various temperatures. The results reveal that the oxygen atoms escape for Bi2Sr2CaCu2O8+δ samples annealed in H2 atmosphere is devided into two steps. First, the extra oxygen atoms residing between the Bi-O layers escape, and the carrier concentration of samples decreases, the superconducting transition temperature Tc of samples is modulated. Second, the oxygen atoms in the CuO2 planes are removed, and the oxygen vacancies, which induce the short range 2D-AFM order of Cu2+ to decrease, emerge in the CuO2 planes, We suggest that the variation of Tc led by hydrogen absorption in the Bi2Sr2CaCu2O8+δ superconductor might be mainly brought on by the oxygen content variation in the course of absorbing hydrogen, rather than by the electron dopping effect of hydrogen atoms.
A SUPERCELL LDA-LMTO-ASA CALCULATION OF COMPOSI-TION DEPENDENCE OF HOPFIELD CONSTANT AND Tc IN Ba1-xKxBiO3
Authors: SHEN YAO-WEN  , HUANG MEI-CHUN  ,   厦门大学物理系,厦门361005
Published: November 2020

The electronic structure of (Ba1-xKx)BiO3 has been calculated by using a supercell LDA-LMTO-ASA method at some compositions. The calculation was performed by doubling unit-cell for x=0.25, 0.5 and 1.0 and by quadruple unit-cell for x = 0.25 and 0.75. The band parameters, total density of states TDOS (EF), partial DOS PDOS (EF) and self-consistent potential Vt(r), obtained from LMTO calculation were combined with the experimental Debye temperature ΘD From this, the Hopfield constant ηt, electron-phonon coupling constant λ and superconducting transition temperature Tc and its x-dependence were evaluated by the McMillan theory and Gaspari-Gyorffy approximation. It was found that the λ≈1 and the maximum Tc≈ 10K which is a slowly varying function of composition x. Our results exhibit a significant difference between the traditional theory and experiment and imply a mechanism which would be related to the composition dependent structure transformation besides the BCS methanism.
THE MAGNETIC SURFACE EFFECT OF NICKEL ULTRAFINE PARTICLES
Authors: WANG WEN-NAI  , ZANG WEN-CHENG  , GU GANG  , DU YOU-WEI  , HONG JIAN-MING  ,   (1)南京大学物理系,南京210008; (2)南京大学现代分析中心,南京210008
Published: November 2020

In this paper, we report the investigation of nickel ultrafine particles (UFP) with surface oxide through the measurement of macro-magnetic properties. Besides the strong effective ani-stropy on the surface or/and the interface, we find that the nickel UFP, shows extra magnetization, which is contributed by the surface or/and the interface.
MONTE-CARLO STUDIES OF RADIATION DAMAGE CAU-SED BY FUSION a-PARTICLES IN THE FIRST WALL(Ⅲ)——DEPTH DISTRIBUTION OF DISPLACED ATOMS IN SOLIDS
Authors: SHAO QI-YUN  , PAN ZHENG-YING  , CHEN JIAN-XIN  , HUO YU-KUN  ,   复旦大学物理二系,上海200433
Published: November 2020

By means of the Monte-Carlo method based on the binary collision approximation, we investigate the depth distribution of displaced atoms in solids induced by fusion α-particles. The relations between the distribution of displaced atoms and the energy deposition profiles in solids are studied. The dependence of the incident energy and angle of a-particles, as well as the component of the target element on the depth distribution of displaced atoms are presented. It is shown that the displacement damage has close relation with the deposition energy caused by ion-bombardment. Also, the displacement damage created by fusion α-particles is stainless steel (Fe0.73Cr0.18Ni0.09) is less than that in SiC.
THE FREE AND RANDOM DIELECTRIC RELAXATIONS
Authors: LI JING-DE  , LI JIA-BAO  , FU SHI-LIU  , SHEN WEN-BIN  ,   中山大学物理系,广州,510275
Published: November 2020

A method of Fourier transform dielectric spectrometer is described, it leads to simplifying the process of solving spectrum and to save the memory capacity for data. Using this method, it is shown that for the same dielectric sample the free and random relaxation will appear under different condition in the time range of 106 to 10-4 seconds, that was predicted by the phe-nomenoiogical theory. The relaxation times are related to the resistance R of the measurement circuit joinning the two electrodes of the sample.. Large value of R leads to a relaxation time of open circuit, and small ones lead to the limit of short circuit; the relaxation time of open ciecuit may be as large as 106 times of the short circuit one. The variation in frequancy domain spectrums of complex dielectric constant is given from open to short circuit cases.
BACK REACTION IN VAIDYA-SCHWARZSCHILD-DE SITTER SPACE-TIME
Authors: DAI XIAN-XIN  , ZHAO ZHENG  ,   北京师范大学物理系,北京,100875
Published: November 2020

The back reaction in Vaidya-Schwarzschild-deSitter spacetime is discussed. It influences location and temperature of both the black-hole event horizon and the cosmological one.
DYNAMIC BEHAVIOR OF A TWO-TERMINAL ACTIVE NETWORK SYSTEM WITH NONLINEAR NEGATIVE RESISTANCE
Authors: PENG JIAN-HUA  , XI YING  , TIAN XIAO-JIAN  ,   (1)长春冶金地质专科学校,长春,130021; (2)东北师范大学物理系,长春,130024
Published: November 2020

A numerical investigation has been carried out on a RLC series connection which is a two-terminal active network system with nonlinear negative resistance. It is found that within various parameter regions, a sequence of period doubling bifurcations, an inverse sequence of chaotic bands and an intermittant chaos phenomena appeared respectively. These results agree with our experimental ones very well.
HIGHLY CHARGED ION N6+ COLLISIONS WITH ATOM He INTO EXCITED STATES
Authors: PAN GUANG-YAN  , YANG FENG  , LI DA-WAN  , LU ZHAN-WEN  , ZHANG WEN  , XU QIAN  , LIU HUI-PING  , ZHAO MENG-CHUN  ,   (1)中国科学院兰州近代物理研究所,兰州,730000; (2)中国科学院物理研究所,北京,100080
Published: November 2020

The excitation processes in collisions between N6+ and He have been investigated by using the ECR ion source and the LHT-30 VUV Monochromator. The emission spectra shows that there are three channels of excitation in the N6+ and He collision system: (1) Single-electron capture into excited states. (2) Double-electron capture into excited states. (3) Direct excitation of indicident ions.
ALTERNATING CURRENT SUSCEPTIBILITY STUDIES OF Y-Ba-Cu-O (123) BULK MATERIAL PREPARED BY MELT-TEXTURED GROWTH METHOD
Authors: WANG SHUN-XI  , WANG YU-GUI  , CHEN XIANG-AI  , YUAN SONG-LIU  , ZHOU XIAN-YI  , CAO LIE-ZHAO  , ZHANG QI-RUI  ,   (1)中国科学技术大学物理系,合肥,230026; (2)中国科学技术大学物理系,合肥,230026;浙江大学物理系,杭州,310027; (3)中国科学院等离子体物理研究所,合肥,230031
Published: November 2020

The a.c. susceptibility of Y-Ba-Cu-O(123) bulk material prepared by melt-textured growth (MTG) method was studied and compared with that of sintered sample in this paper. The results show that there are two peaks in the imaginary part corresponding to the grains and grain boundaries in the sintered sample, but only one peak is observed in that of MTG sample of high quality. As for that of MTG sample of worse quality, also two peaks are observed, but they correspond to grains with different growth direction. No frequency effect is observed in both the sintered sample and the MTG sample, showing that the loss is related to flux motion.
MAGNETIZATION MEASUREMENT OF ANISOTROPIC CRITICAL CURRENT DENSITIES IN MELT TEXTURED YBa2Cu3O7-y
Authors: FAN HONG-CHANG  , JIN XIN  , LU MU  , ZHANG YI-TONG  , XU XIAO-NONG  , YAO XI-XIAN  ,   南京大学物理系,固体微结构物理国家实验室,南京,210008
Published: November 2020

Anisotropic critical current densities of melt textured YBa2Cu3O7-y superconductor were measured using d.c. magnetization measurements. Effcet of demagnetizing field was taken into account. A model appropriate to finite anisorropic samples was adopted and the method proposed recently by Gyorgy et al. was modified. We measured magnetization curves of a rectangular parallelepiped sample in magnetic fields parallel to different edges of the sample and obtained values of three different critical current densities.
SYMMETRY GROUP AND HARMONIC POTENTIALS OF A MAGNETOSTATIC MULT1POLE
Authors: LI Yü  ,   上海机械学院应用物理研究室,上海200093
Published: November 2020

In this paper, a magnetostaric multipole with a control vector is studied. The relation between the symmetry transformation of this multipole and that of its M-tunction is derived. A rigorous, general and simple method for deriving the constraints of the symmetry group of this multipole on its harmonic potentials has beenset up.
EFFECTS OF THE CORE POLARIZATIONS ON THE HYPER FINE INTERACTION OF THE TRIPLET (3d2)3P STATES OF ScII
Authors: XI JIN-HUA  , WU LI-JIN  ,   中国科学院武汉物理研究所波谱与原子分子物理开放研究实验室,武汉,430071
Published: November 2020

The hyperfine interaction constants of the triplet (3d2)3P states of Sell are calculated using Rayieigh-Schr?dinger perturbation method. The core polarizations are included to all orders using a recurrence formula and the correlations to low orders. The results are compared with experimental data and MCDF calculations of Young et al. It is found that the core polarization (especially the spin polarization) has drastic effects on the magnetic dipole interaction constant. Our results for constant A (MHz) are-116.667 and -12.442 for 3P1 and 3P2 states respectively, that of the experiments are-107.3(6) and -27.7(8), whereas the MCDF calculations of Young et al. obtained-1.8 and 85.9.
ESTIMATION OF LASER RESONANCE IONIZATION EFFICIENCY
Authors: ZHANG LI  , SHANG REN-CHENG  , XU SI-DA  ,   清华大学现代应用物理系,北京,100084
Published: November 2020

This article is to solve the rate equations of laser resonance ionization for a three energy level system with little simplification. Three cases of utilizing continuous, quasi-continuous and pulsed laser are discussed respectively. The results of typical conditions presently available are given. The variation of the results with different parameters are discussed as well. The calculation method and program can be used for general purpose. As long as the necessary parameters have been determined, the program can be used for quantitative calculation of an experiment.
A THEORY OF HYDROGEN-INDUCED CRACK PROPAGATION IN AN ELASTIC CONTINUOUS MEDIUM
Authors: JIANG SHENG-RUI  , QUAN HONG-SHUN  ,   兰州大学物理系,兰州,730000
Published: November 2020

Induced by the crack stress field, hydrogen atoms tend to gather together to form hydro-gen atmosphere in an elastic continuous medium. The average hydrogen concentration of this hydrogen atmosphere is calculated in this paper. By regarding this hydrogen atmosphere at the crack tip as an elastic inclusion, the eigen-strain of the inclusion is calculated and the influence of the stress field pij to crack dislocation density is studied. Thus the total stress intensity factor of the crack tip is obtained. We infer that the mechanism of the hydrogen embritt-lement is the enlargement of the crack stress intensity factor by this hydrogen atmosphere. The physical process of the hydrogeninduced crack propagation is also discussed. The calculated propagation rate of the crack agrees quite well with the experimental result.
INFLUENCE OF ARGON ADDITION ON THE GROWTH OF DIAMOND-LIKE FILM
Authors: GAO KE-LIN  , ZHAN RU-JUAN  , HUANG WEI-DONG  , ZOU ZU-PING  , WANG YAN-XIA  , XIANG ZHI-LIN  ,   (1)中国科学技术大学近代物理系,结构分析开放研究实验室,合肥,230026; (2)中国科学技术大学近代物理系,结构分析开放研究实验室,合肥,230026;中国科学院武汉物理研究所,武汉,430071
Published: November 2020

In deposition of the diamond-like films by electron assisted plasma chemical vapor deposition, two systems (CH4/H2 and CH4/H2/Ar) have been used and compared. The electron temperature and electron density have been measured by means of Langmuir single probe. The results show that the electron density in CH4/H2/Ar is higher than that in CH4/H2, and the growth rate of the films increases in CH4/H2/Ar system.
EFFECT OF e-e INTERACTION ON THE SOLITON PAIR IN Na-DOPED TRANS-POLYACETYLENE
Authors: CUI YUN-LONG  , LIN SEN-HAO  , ZHANG JIA-HUA  ,   中国科学院上海原子核研究所,上海,201800
Published: November 2020

The Hamiltonian we used includes the static SSH model, the Hubbard model and Na+ phenomenological potential in trans-polyacetylene. When the distance of the soliton pair in Na-doped trans-polyacetylene is 15α, the effect of e-e interaction within an unrestricted Har-tree-Fock scheme on the band structure of trans-polyacetylene, the charge density of the chain and the half-length of the soliton are studied.
AN IN-LINE ANALYSIS SYSTEM OF SLOW POSITRON BEAM FOR MOLECULAR BEAM EPITAXY
Authors: HE YUAN-JIN  , HU YONG  , DAI LUN  ,   清华大学现代应用物理系,北京,100084
Published: November 2020

The design and arrangement of an in-line analysis system of slow positron beam for molecular beam epitaxy is described and the analysis method using positron beam technique to study semiconductor films is introduced. In the slow positron moderator, a combination of tungsten-rings and "Venetian blind" structure are used to obtain a higher efficiency of conversion from fast to slow positrons.
SUPERCOHERENT STATES AND BERRY'S PHASE
Authors: CHEN CHENG-MING  , XU DONG-HUI  ,   浙江大学物理系,杭州,310027
Published: November 2020

Supercoherent states as the result of acting of displacement operator on a supersymmetric hamiltonian are introduced and discussed. Berry's phase is calculated for coherent states as their parameters are taken to be varying adiabatically.
A METHOD FOR FINDING THE EIGENVALUE OF QUANTUM GROUND STATE
Authors: ZHU DONG-PEI  , SHI MING-JUN  , CHEN YIN-HUA  ,   中国科学技术大学近代物理系,合肥,230026
Published: November 2020

With an integral transformation, the energy eigenvalue problem of a quantum system is converted into the solving of a non-linear Riccati equation. It is easy to find the ground state energy and the corresponding wavefunction. The relation with usual factorization method is discussed. The ground states of various quanum systems are calculated to show the advantage of this new method.
SCALING BEHAVIOR IN WEAK-COUPLED COMPLETE MAPS
Authors: LU YAN-NAN  , DING E-JIANG  ,   (1)北京师范大学低能核物理研究所,北京,100875; (2)中国科学院理论物理研究所,北京,100080
Published: November 2020

The first Lyapunov exponent for a one-dimenssional unimodal map system with very weak coupling strength is calculated. The numerical results show that there is a universal scaling relation between the first Lyapunov exponent and the coupling strength.
A STUDY FOR THE INFLUENCE OF CH2Cl2,CHCl3, CCl4 ON THE PHOSPHATIDYLCHOLINE LIQUID-CRYSTAL STRUCTURE BY MEANS OF THE SMALL- ANGLE X-RAY SCATTERING
Authors: SUN RUN-GUANG  , WANG DE-HUA  , WANG ZI-HAO  , ZHANG JING  ,   (1)陕西师范大学实验中心,西安,710062; (2)西安化工研究所,西安,710002
Published: November 2020

This article presents the results of the research using the mothod of SAXS(small angle X-ray scattering) to investigate the influence of CH2Cl2, CHCl3 and CCl4 respectively on the liquid-crystal structure of phosphatidylcholine (PC). Experiments show the following phenomena: The structure of the PC liquid-crystal phase is primarily influenced by space-spinning electronic cloud density distribution of CH2Cl2, CHCl3 and CCl4. The compounds that their space-spinning electronic cloud density distribution assume spinning ball or spinning oval ball in shape all give the mechanism that makes the PC liquid-crystal state to form lamellar and hexagonal phase. And the compounds that their space-spinning electronic cloud density distribution assume spinning taper in shape give the mechanism that makes the PC liquid-crystal state to form hexagonal Ⅱ phase.
A STUDY ON DYNAMICS OF dc GLOW DISCHARGE PLASMA AT AXIAL DIRECTION
Authors: LIU ZU-LI  , SONG WEN-DONG  , WEI HE-LIN  , LI ZAI-GUANG  ,   (1)华中理工大学激光技术国家实验室,武汉,430074; (2)华中理工大学物理系,武汉,430074
Published: November 2020

We study one dimensional dynamics of dc glow discharge for parallel plates, taking into account the effect of inelastic collisions between electrons and neutral particles on the energy and momentum loss by the MHD theory. The distributions of density, velocity and temperature of plasma and the electric field for Ar plasma are obtained. It is found that the gas pressure and the electrode spacing give significant influence on electron density in the cathode region, but the influence on ion density is small.
THE EFFECT OF ION CYCLOTRON RESONANCE HEATING ON LOWER HYBRID CURRENT DRIVE IN TOKAMAK PLASMA
Authors: SHEN LIN-FANG  , YU GUO-YANG  ,   中国科学院等离子体物理研究所,合肥,230031
Published: November 2020

A possible process occurring when ICRF wave for second harmonic heating of deuterium and LH wave for current drive are launched simultaneously into a D-T plasma in tokamak reactor is studied. The particle absorption of LH wave is calculated using linear theory. In combination with ICRH the LH-current drive efficiency is reduced. It decreases with increasing ICRF power due to the competing absorption of LH power by energetic D+. The absorption of LH wave by the energetic deuterium can be lowered by raising the LH wave frequency.
EXTENDED ELECTRONIC STATES IN A CLASS OF ONE DIMENSIONAL QUASIPERIODIC SYSTEMS
Authors: YAN XIAO-HONG  , YOU JIAN-QIANG  , ZHONG JIAN-XIN  , YAN JIA-REN  ,   (1)湘潭大学科学技术研究所,湘潭,411105; (2)湘潭大学物理系,湘潭,411105
Published: November 2020

Using the dynamical-map method, we study the electronic properties for diagonal and off-diagonal tight-binding model in a class of one-dimensional quasiper-iodic systems. These systems are associated with the generalized Fibonacci sequences S∞ given by the recursion relation Sl+1=Sl2j-1Sl-12i for l≥1 with two initial sequences S0 and S1, where i and j are positive integers. Analytical treatments show that the extended electronic states for these one-dimensional quasiperiodic sequences really exist.
PHOTOLUMINESCENCE OF ZnSe-ZnS STRAINED-LAYER SUPERLATTICES
Authors: JIANG FENG-YI  , PAN CHUAN-KANG  , FAN GUANG-HAI  , FAN XI-WU  ,   (1)江西工业大学,南昌,330029; (2)中国科学院长春物理研究所,长春,130021
Published: November 2020

The photoluminescence (PL) emission spectra of ZnSe-ZnS strained-layer surerlattices (SLS) grown by atmospheric pressure metal organic chemical vapor deposition (AP-MOCVD) have been studied in this paper. With the high density excitation (N2-Laser 337.1nm), the PL of the SLS consist in only one emission peak due to the n = 1 heavy hole excitons recombination, and with the low density excitation (high pressure Hg-Lamp 365.nm) the PL consist of both the band-edge emission and the deep-centre emission. One gap-edge emission peak without the deep-centre emission have been observed in the low-excitation PL, and the sample was thought to have good crystaline quality. The subbands of ZnSe-ZnS SLS were calculated using the theoies of the stress-induced baud structures and the Kronig-Penney band model. The two emission peaks, the energy of which are greater than the energy-gap of ZnSe single crystal films in the absence of strain, were observed in the PL spectra of ZnSe-ZnS SLS for the first time. According to the subband calculation, the two peaks were thought to be caused by the transitions between the n= 1 electronic subband and the n= 1 heavy, light holes' subbands, respectively.
THE FORMATION MECHANISM OF HIGH-Tc PHASE IN Bi-BASED SUPERCONDUCTOR
Authors: QIU XIN-LIANG  , LI CHENG-REN  , XIN MIAN-RONG  , LUO CHANG-XUN  ,   (1)陕西师范大学物理系,西安,710062; (2)西北有色金属研究院,宝鸡,721014
Published: November 2020

In this paper, the formation process of high-Tc phase in Bi-based supercondutor is investigated by X-ray diffraction etc. The high-Tc phase might be formed in the following manner. At first, the nuclei of hig-Tc (2223) phase are formed by the reaction of Sr-Ca-Cu oxide with low-Tc (2212) phase; Then the nuclei of 2223 phase grows, following the manner of ordinary crystal growth. There are two ways to form Sr-Ca-Cu oxide. One is accomplished by solid state reaction between Ca2CuO3 and Ca3(1-x)Sr3xCu5O8, and the other by liquid-state reaction of Ca2PbO4, 2212 phase and CuO. The liquid-state reaction rate is much quicker than that of solid state reaction. So, the rate of formation of 2223 nuclei can be accderated in liquid-state reaction. Based on this mechanism, we propose that Pb can only accelerate the nucleation of 2223 phase and exert no significant influence on the growth of 2223 phase.
STRUCTURAL TRANSITIONS AND FREE-VOLUME PROPERTIES OF PMMA POLYMER STUDIED BY POSITRON ANNIHILATION
Authors: LIN DONG  , WANG SHAO-JIE  ,   武汉大学物理系,武汉,430072
Published: November 2020

Positron lifetime and Doppler broadening of annihilation radiations have been measured for PMMA polymer in temperature range from 20℃ to 150℃. The O-Ps annihilation and Doppler broadening data consistently show the structural changes in PMMA. The transitions at 48℃ and 108℃ are attributed to the β transition and glass transition of PMMA respectively. An anomalous change of o-Ps lifetime and intensity around 84℃ is found to be the result of the mergence among some freevolume voids. The results of Doppler broadening measurement also give the information about the variations of degree of structural order. The temperature dependences of size and concentration of free volume in PMMA are estimated from the experimental o-Ps annihilation parameters.
PHOTOELECTRON SPECTROSCOPY STUDIES OF α-P/GaAs (100) INTERFACES
Authors: LU XUE-KUN  , HOU XIAO-YUAN  , DONG GUO-SHENG  , DING XUN-MIN  ,   复旦大学应用表面物理国家重点实验室,上海,200433
Published: November 2020

The room temperature deposited α-P/GaAs(100) interfaces have been studied by XPS, UPS, and LEED. The results show that P is adsorbed as clusters on the surface of GaAs at the initial stage of the interface formation, α-P film is formed as the deposition amount is further increased. The valence structures of the films so obtained are similar to those of plasma deposited α-P:H films. There are about one monolayer of P atoms bonded to Ga atoms of the substrate at the interface, α-P overlayer results in 0.2 eV lowering of GaAs surface barrier.
DISLOCATION IN MOVING NEAR THE FREE SURFACE ——ANISOTROPIC CASE
Authors: LI GUO-WANG  , HUANG LIN-GEN  , YANG SHUN-HUA  ,   (1)北京科技大学材料物理系,北京,100083; (2)北京科技大学物理系,北京,100083
Published: November 2020

In this paper, the Eshelby theory of static dislocation in infinite anisotropic medium is extended, and combining the integration method with Green tensor function, to treat a dislocation moving uniformly near free surface. We take the system of γ-Fe/free space as an example to perform numerical calculation, the result shows the influence of dislocation motion on its elastic fields. As the velocity of dislocation v→0, the result coincide with that of static disloca-tion. On field point more close to the surface, the influence of the surface becomes more significant. The calculated "image force" acting on the dislocation shows that the action of the surface is attractive in nature. The simple theory and method suggested in this paper can be applied to calculate the elastic field of and "image force" on moving dislocation in any anisotropic medium, and would be significant in investigation of mechanical properties of the me dium.
BEHAVIOR OF A WEAK COUPLED MAP SYSTEM IN THE PERIODIC WINDOWS
Authors: DING E-JIANG  , Lü YAM-NAN  ,   (1)北京师范大学低能核物理研究所,北京100875; (2)北京师范大学低能核物理研究所,北京100875;中国科学院理论物理研究所,北京100080
Published: November 2020

It is shown analytically as well as numerically that a periodic window of the coupled map system exists only for very weak coupling strength (about 10-3 for period 3 window, for instance), which could be defined as the depth of the window. Within the windows the behavior of the coupled map system could be recovered by dealing with a few number of modes, which consist of coupled three maps. The first Lyapunov exponent for the coupled map system shows a "zigzag" curve form virsus the coupling strength.
LiAr A2Π-X2Σ DIFFUSE EMISSION EXCITED BY Ar+ LASER LINES
Authors: ZHANG LI-MIN  , WEI XUN-BIN  , XIA YU-XING  , ZHANG YUN-SHENG  , GENG YU-ZHEN  , WANG HUI  ,   (1)中国科学技术大学结构分析开放研究实验室,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

Excited by Ar+ laser lines of 457.9, 476.5,496.5, 514.5nm, the 650-760nm diffuse emission of A2Π-X2Σ lor Van der Waal's molecular LiAr has been observed in a lithium heat-pipe oven with Ar gas. The dynamics of this emission is discussed.
DIFFERENTIAL CROSS SECTIONS FOR ELECTRON IMPACT IONIZATION OF HELIUMLIKE IONS
Authors: FANG DU-FEI  , WANG YAM-SEN  , HU WEI  ,   复旦大学核科学系,上海200433
Published: November 2020

The electron impact ionization cross sections for different energy assignment on two final-state electrons (energy differential cross sections) of heliumlike ions have been calculated by using a disrored-wave Born exchange approximation. We found that the dependence of the differential cross sections on the scaled energy of secondary electrons can be well fitted with a two-parameter Gaussian function. The dependence cf two parameters on the incident electron energy and target charges have been given. The differences between the results from CBE (Coulomb-Born exchange approximation) and DBE calculations have been discussed. They show that it is necessary to use DBE calculation for low target charges and low incident en-
SPECTRUM ANALYSIS OF IMAGING INTEGRAL OPERATOR FOR OPTICAL SYSTEMS WITH SYMMETRIC ABERRATIONS
Authors: SONG FEI-JUN  ,   中国科学院中国大恒公司,北京100080
Published: November 2020

The theory and approach of the eigenvalue problems of the imaging integral operator of finite domain are discussed in detail. The approximation solution of the imaging integral operator equation is derived by expanding the eigenfunctions in the space of the zeroth-order eigenfunctions. The eigenvalues and eigenfunctions for real microscopic objectives with symmetric aberrations are calculated in terms of the measured LSF data. The experimental system is described and the results are discussed.