bluuebunny/crossref_metadata_2025 huggingface dataset:
THE TOTAL VOLUME FRACTION OF VOIDS OF RF SPUTTERED AMORPHOUS SILICON
Authors: FEI QING-YU  , HUANG BING-ZHONG  ,   (1)电子工业部中国电子产品可靠性与环境试验研究所; (2)中山大学物理系
Published: December 2020

The principle and method of measurement and calculation of the total volume fraction of voids of RF sputtered amorphous silicon by speetroscopic ellipsometry and effective medium theory is described. It is found that the changes in the electrical and optical properties among amorphous silicon films deposited in different argon pressure may be satisfactorily explained in terms of changes in the total volume fraction of voids. This suggests that it is significant to measure and calculate the total volume fraction of voids of a-Si. The good agreement between the result of total volume fraction of voids and the measured result of total volume fraction occupied by Ar atoms shows the validity of the method.
THERMODYNAMIC PROPERTIES OF THE ONE-DIMENSIONAL EXTENDED HUBBARD MODEL (Ⅱ)——U<0
Authors: XU HUI  , ZHANG KAI-YI  ,   (1)东北工学院物理系; (2)中南矿冶学院数理系
Published: December 2020

Entropy, internal energy, specific heat, and magnetic susceptibility of the one-dimensional negative-U extended Hubbard model are computed. An analytical solution of magnetic susceptibility in the strong-coupling (|U|→∞) limit is obtained. Therma-dynamic properties of the system can be discussed in two temperature regions. The high T-region corresponds to decrease in number of double occupied states. The low T-region corresponds to the distribution of electron charge. The effect of W on the-rmodynamic properties is obvious.
MINIMA OF OSCILLATOR STRENGTH DENSITIES FOR EXCITED ATOMS
Authors: LIANG XIAO-LING  , LI JIA-MING  ,   中国科学院物理研究所
Published: December 2020

Based on Hartree-Slater self-consistent potentials, we have studied minima of oscillator strength densities, namely, zeroes of electric dipole matrix elements for excited alkli atoms (here oscillator strength densities proportional to photoabsorption cross sections). Thus we have induced further the systematics about the zeroes of dipole matrix elements between eigenchannels for other excited atoms, namely, the relation between the zeroes and the quantum defect differences for corresponding initial and final channels. Based on such a relation, we predict the photoabsorption windows for excited Ne(3s) and excited Ar(4s), which have been confirmed by a recent experiment.
THE MODIFIED EXCITED-STATE POLARIZATION MODEL
Authors: XIAO DING-QUAN  ,   四川大学物理系
Published: December 2020

The excited-state polarization model is modified by taking into account the different pyroelectric processes in polar crystals and the difference between the mean emission frequency ν2 and the electronic transition frequency ν3 which results from the stokes shift in the radiative trasition. According to this model, the results for the dipole moment charge △μfrom different specimens of crystal LiNbO3 :Cr3+ used by different authors are identical within experimental errors: △μis about 3 Debye, and almost indepeudent of temperature in the whole experimental temperature region 50—300 K.
SCALING RELATION OF GENERALIZED OSCILLATOR STRENGTH DENSITY ALONG ISOELECTRONIC SEQUENCE
Authors: PAN XIAO-CHUAN  , LI JIA-MING  ,   中国科学院物理研究所
Published: December 2020

The differential cross section and total cross section of high-energy electron impact excitation can be calculated by Born approximation. The differential cross section is propotional to the so called generalized oscillator strength. The target atom or ion may be excited to infinite number of bound states and adjoint continuum states which can be treated in an unified manner by Quantum Defect Theory. Thus, we define generalized oscillator strength density (GOSD) as the generalized oscillator strength per unit of excitation energy. We have calculated the GOSD's of the lithium-like isoelectronic se-quence(Li, Be+, B++, C3+, Ne7+, Na8+, K16+) for excitation from the ground state to S, P, D and F channels. The scaling relation along isoelectronic sequence is discussed.
STRESS DEPENDENCE OF DEFECT LEVELS IN SEMICONDUCTORS
Authors: LI MING-FU  ,   中国科学技术大学研究生院
Published: December 2020

New criterion for symmetric properties of defect potential in semiconductors is presented. For a degenerate energy level Es, we introduce the average Es of energy splitling under stress. Es is invariant under symmetry operation of Hamiltonian. Therefore, it is straight foward to reduce the stress coefficient tensor of Es by group theoretical method. For instance, for cubic semiconductors, if the defect level ET is withdefect potential of T group symmetry, the uniaxial stress coefficient of (?(Ec-ET))/(?F) or (?(ET-Ev))/(?F) is isotropic and equal to one third of corresponding hydrostatic pressurecoefficient. The case of defect potential with C3v symmetry is also discussed.The electron (or hole) emission and capture processes of defect levels under energy splitting are analysed. The weighted average of emission rate en and capture rate cn satisfy the following relation: en=gTgc-1cnN′ce(-(Bc-BT)/kT) By measuring the stress dependence of en., various schemes for determining the symmetry property of defect potential are discussed. The transient processes under defect level splitting are also discussed. When transitions are al lowed between the splitting states, the transient is exporential with single decay time constant en-1. When transitions between different states are forbidden, the transient is decay with multi-exponential time constants. en is determined by the initial transient slope.
THE INFLUENCE OF PHOTO-INDUCED REFRACTIVE INDEX CHANGE ON RAMAN SPECTRA OF LiNbO3:Fe CRYSTALS
Authors: LIU SI-MIN  , ZHANG GUANG-YIN  , WU ZHONG-KANG  , HUANG ZHI-MING  , XU LIANG-YING  ,   (1)南开大学物理系; (2)中国科学院上海硅酸盐研究所
Published: December 2020

Following our previous work [1], the influence of photo-induced refractive index change on Raman spectra of LiNbO3 crystals doped with 0.07% Fe has been further studied. Anomalous phenomenon appeared in x(zx)z and y(zy)z geometry. This can be explained as the result of interaction between the polarization electrical field of extraordinary phonon and the strong space charge field forming after photo-induced refractive index change in the crystals.
MAGNETIC MOMENT AND CURIE TEMPERATURE OF AMORPHOUS FeTmB ALLOYS
Authors: ZHAN WEN-SHAN  , SHEN BAO-GEN  , ZHAO JIAN-GAO  ,   中国科学院物理研究所
Published: December 2020

Systematic experimental results for atomic magnetic moment and Curie temperature for amorphous alloys FeTmB(Tm=Ti, V, Cr, Mn, Zr, Nb, Mo, Ta, W) prepared by the drum spinning techniqul are reported. The average magnetic moment for each Ye atom is about 2.0 μB in all amorphous FeTmB alloys. The localized characteristics for Tm atom in the amorphous state is much outstanding than in the crystalline state. The average magnetic moment for each IVB(Ti), VB(V), VIB(Cr), VIIB(Mn) atom related with the number of outer electrons per atom is about 4, 5, 4, 3 μB, respectively, and is antiferromagnetic coupling with the Fe magnetic moment. The experimental data of the magnetic moment change rate dμ/dx is in good agreement with the calculated value using a mixed model. According to Friedel's VBS model the delectron states of IVB(Ti), VB(V) elements are completely above the Fermi level EF, but for the VIB(Cr), VIIB(Mn) elements they cross the Fermi level EF.
LASER INDUCED ENERGY TRANSFER PROCESS IN Ba-Yb
Authors: ZHANG DAO-ZHONG  , CHENG BIN-YING  , JU RUI  , ZHAO XAO-KANG  ,   中国科学院物理研究所
Published: December 2020

The collisional interaction between Ba and Yb is not pure dipole-dipole. The maximum of transfer cross section appears at the induced laser wavelength, which corresponds to the interatomic transition. The effect of spin interaction is observed.
THE EFFECT OF Ta ON BEHAVIOR OF PHONONS IN SUPERCONDUCTORS C-15 V2 Hf AND V2(Zr0.5Hf0.5)
Authors: LI JI-ZHOU  , LI ZHU-QI  , YE CHUN-TANG  , LI QIAN-KUN  , ZHENG ZHI-TAO  , ZHOU LI  , YIN DAO-LE  ,   (1)北京大学物理系; (2)有色金属研究总院; (3)中国原子能科学研究院
Published: December 2020

Inelastic neutron scattering spectra from C-15 phase superconducting alloys V2Hf, V2Ta, V2Hf0.8 Ta0.2, V2Zr0.5 Hf0.5 and V2Zr0.5 Hf0.33 Ta0.17 were measured by the neutron time-of-flight method, and their relative phonon densities of states were evaluated. The present results show that the phonon frequencies soften with the increase of the superconducting transition temperature Tc and harden with the decrease of the Tc, which is in agreement with our previous results of "The effect of Nb on phonons of superconductors C-15 V2Zr and V2(Zr0.5 Hf0.5)". This means that for these superconductors the elastic softening plays a role in enhancing Tc to some extent. It seems that between V2Zr or V2Hf and V2(Zr0.5 Hf0.5) there exists essential difference, which makes Tc increasing and the phonon frequencies softening for the formers while Tc decreasing and the phonon frequencies slightly hardening for the later after adding small amounts of Nb or Ta. It can be considered as the result of hybridzation of conduction bands, which is studied by means of the LMTO (linear combination of muffin-tin orbitals)method.
PRESSURE DEPENDENCE OF THE ABSORPTION EDGE OF SEMIMAGNETIC SEMICONDUCTORS Cd1-xMnxTe
Authors: Shan Wei  , Shen Xue-chu  , Zhao Min-guang  , Zhu Hao-rong  ,   (1)四川师范大学物理系; (2)中国科学院上海技术物理研究所
Published: December 2020

The effect of pressure on the optical absorption edge for mixed crystals Cd1-xMnxTe with different manganese concentrations in the range of lbar to 40 kbar and at room temperature is reported. The observed absorption edge shifts to higher energy with increasing pressure at a rate of a = 6-8 ×10-3 eV/kbar and a second order coefficient with the order of magnitude 10-5 eV/kbar2 for the samples with x-3 eV/kbar for the samples with x≥0.5. A phase transition from zinc blende to NaCl-type structure occurs for all the samples studied. The transition pressures depend on the Mn contents in the samples in the region of 25—40 kbar. The physical origins of different pressure coefficients are discussed in the light of the deformation potentials of energy band slates and the hybridization of the Mn2+ 3d levels with the p-like states in the valence band.
ENERGY BAND CALCULATION FOR GaAs, GaP AND GaAsxP1-x
Authors: Xue Fang-shi  ,   南京电子器件研究所
Published: December 2020

The energy bands of GaAs, GaP and GaAsxP1-x are calculated using the zone-variational method. Since there are different atoms in a cell, different radii are selected for various atomic spheres according to the actual size for corresponding atoms. The crystal potential is calculated by superposing various atomic potentials. Since the atomic potentials are distorted in the bonding sphere under the interaction with other atoms in crystal, a few adjusting parameters are selected to adjust the corresponding atomic potential and an analytical expression is used to approach the resulted potential. The potential adjusting parameters are selected to make the calculated energy band close to experimental results. The band structures which agree with experimental results are obtained for GaAs and GaP. Furthermore, these poteatials are used to calculate the energy band of GaAsxP1-x.
SPACE-TIME STRUCTURE OF THE SUPERPOSITION OF TWO CO-LINEAR KERR BLACK HOLES'METRICS
Authors: Huang Chao-guang  , Wang Yong-cheng  ,   (1)北京师范大学物理系; (2)北京师范大学物理系,中国科学院高能物理研究所
Published: December 2020

The space-time structure of the superposition of two colinear kerr black holes is studied by the imaginary weyl coordinate method. The space-time region within the horizons in this case is described. Also, the variation of the shape of the inner infinite redshift surface and theposition change of singularities with z0 when 2z0>(M12-a12)1/2+(M22-a22)1/2 is obtained. Fromthis, we can conclude that when z0→(M2-a2)1/2, the space-time structure does not tend to one kerr space-time for parallel identical kerr solutions or one Schwarzschild-NUT metric for anti-parallel identical kerr solutions even though the structure of the space-time outside the outer horizons does, and that there exist the solutions of Einstein's equations without naked singulari-ties (but not without any singularity) when 2z0>(M12-a12)1/2+(M22-a22)1/2.
FEEDBACK STABILIZATION OF AXISYMMETRIC MODES IN NON-CIRCULAR TOKAMAKS
Authors: Zhang Zuo-yang  , Huo Yu-ping  ,   中国科学院等离子体物理研究所
Published: December 2020

The feedback stability of axisymmetric MHD mode in tokamaks with unclosed shell has been studied analytically through solving directly the boundary problem of the perturbed magnetic surface in the vacuum region. For plasma torus with elliptical cross-section, a feedback system with conducting shell and active control coils has been suggested. The result shows that two unclosed shells arranged above and below the plasma have a very strong stabilizing effect. The re istive shell can suppress the modes with faster growth rate and the active coils can be used to stabilize the slower modes.
LOW FREQUENCY INTERNAL FRICTION OF MOVING MAGNETIC DOMAIN WALLS IN PURE IRON
Authors: Zhen Wen-guang  , Zhang Jin-xiu  , Lin Hao-qing  , He Zhen-hui  , Yao Yi-fa  ,   (1)中山大学,85届毕业生; (2)中山大学物理学系
Published: December 2020

The low frequency internal friction (Q-1) of pure iron wires in a d.c. magnetic field increasing with a constant rate (H = const) was studied by a torsion pendulum a room temperature. It was found that Q-1 is composed of a static part Q0-1 (at H=0) and a dynamic part Qm-1 (at H≠0) which is viscoelastic type. The values of Qm-1 are independent of the strain amplitude Aε (in the range of 10-6 to 10-5), increase with the increase of H/ω and drop almost down to the ualues of Q0-1 when H changes suddenly from some ualue to zero. The behaviour of the static part is analogous to that of the resonance damped model of dislocation. The Qm-1-H curves of prestrained specimens are lower than those of annealed Ones and their peaks shift to higher magnetic field.
A DISCRETE SAMPLING METHOD IN OPTICAL TRANSFORMATION
Authors: Chen Yan-song  , Zheng Shi-hai  , Wang Yu-tang  , Dong Bi-zhen  ,   中国科学院物理研究所
Published: December 2020

A discrete sampling method in optical transformation has been suggested in this article. Based on the consideration of unitary transformation, that is important for opcical transformation, conditions of sampling an optical system are obtained. The expression of propagation matrix including the effect caused by the width of sampling window is derived. As an example, the distributions of holographic amplitude and phase calculated by designing a given Walsh transformation are given.
ON THE RELATIVISTIC FIFTH ORDER GEOMETRICAL ABERRATION EQUATION OF A COMBINED FOCUSING-DEFLECTION SYSTEM
Authors: LI YU  ,   上海机械学院
Published: December 2020

In this paper, the relativistic fifth order geometrical aberration equation of a combined electric-magnetic focusing-deflection system with superimposed fields is derived by using varia-tional principle and taking symbolic derivative and inner product of complex numbers as mathematical tools.
SPECTRA INTENSITY PARAMETERS OF DyP5O14 SINGLE CRYSTALS
Authors: WANG QING-YUAN  , ZHANG SI-YUAN  , WU SHI-XUE  , BAI YUN-QI  , REN JIN-SHENG  ,   中国科学院长春应用化学研究所
Published: December 2020

In the present paper, we report the theoretical investigation results of DyP5O14 single crystals derived from absorption spectra according to the Judd-Ofelt theory. The experimental and theoretical oscillator strengths and three phenomenological intersity parameters are calculated. After evaluation the reducible matrix elements, the fluorescent radiative transition probabilities are obtained.
THE OPTICAL CONTRAST OF DISLOCATION IN SYNTHETIC QUARTZ WITH BIREFRINGENCE TOPOGRAPHY
Authors: XU XIU-YING  , ZHANG XING-KUI  , FENG DUAN  , NIU ZHONG-MING  ,   (1)南京大学物理系,84届毕业生; (2)南京大学物理系固体物理研究所
Published: December 2020

The contrast of birefringence images of dislocation in synthetic quartz crystal have been calculated with anisotropic elasto-optical coeffficients. Using reflection polarizing microscopy to compensate the natural optical activity, along the optical axis, we obtained the images of edge dislocations and compared it with the calculation.
SUPERCONDUCTING A AND B PHASES IN TRIPLET BIPOLARON SYSTEMS
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: December 2020

Superconducting A and B phases in triplet bipolaron system have been treated by useing the selfconsistent broken-symmetry Hartree approximation. The B phase is always more stable than the A phase in the weak coupling case. But in the strong coupling case, owing to the fluctuation feedback effect, the free energy of the A phase can be lower than that of the B phase, or the A-B transition may occur, which is analogous to the superfluid of 3He. The thermody-namic critical field Hc of the stable phase of the system has also been calculated and compared with the upper critical fields of heavy-fermion superconductors, UBe13, UPt3 and URi2Si2. It has been found that Hc can qualitatively account for the abnormal temperature dependences of the upper critical fields of these superconductors.
THE FUNCTION OF PHASE FACTOR IN SEMICLASSICAL EXPLANATION OF OPTICAL QUANTUM BEAT
Authors: CHEN TIAN-JIE  ,   北京大学物理系
Published: December 2020

A phase factor was introduced into the wave function properly, and the correlation of the dipoles was taken into account by a semiclassical approach. Thus a successful explanation of the observability of quantum beat is obtained for various circumstances. Particularly, it has been made clear that there should be no single atom beat for the lower state splited cases, which removes the difficulty of semiclassical theory in explaining quantum beat. Therefore it has been shown that the semiclassical theory can rise to the challenge from quantum electrody namics in explaining quantum beat.
A STUDY ON VALENCE-BAND PHOTOEMISSION SPECTRA OF NOBLE METAL-GaAs(110) INTERFACES
Authors: PAN SHI-HONG  , MO DANG  , K. K. CHYN  , W. E. SPICER  ,   (1)美国斯坦福大学; (2)南开大学; (3)中山大学
Published: December 2020

The evolution of valence hand photoemission spectra in the formation of noble metal-GaAs (110) interfaces has been studied with 21.2 eV and 40.8 eV photons. For less than 0.5 mono-layer of deposited metals, the so-called atomic-like Ag 5s and Au 6s states have been observed. A maximum in the emission of the valence band of noble metals has been observed in the range from about 10 ? to a few tens ? of deposited metals. The experiment results are discussed with the point of view of metal clustering associated with interfacial reaction.
MAGNETORESISTANCE AND MAGNETIC BREAKDOWN PHENOMENON IN AMORPHOUS MAGNETIC ALLOYS
Authors: CHEN HUI-YU  , GONG XIAO-YU  ,   中国科学技术大学物理系
Published: December 2020

Transverse magnetoresistance in amorphous magnetic alloys (Fe1-xCox)82Cu0.4Si4.4B13.2 were measured at room temperature and in the magnetic field range 0-15 kOe. For large magnetic field, three various functional dependences of magnetoresistance on magnetic field strength have been found as follows: (1) △ρ/ρ approaches saturation. (2) △ρ/ρ increases proportionally to H2. (3) For x = 0.15, sharp △ρ/ρ peak appears at certain magnetic field strenght in spectial angular orientation of both magnetic and electric current. The case (3) is a magnetic breakdown phenomenon. Magnetic breakdown occurs at the gap between the spin-up and spin-down sheets of the Fermi surface. This gap is the spin-orbit gap and its magnitude is a sensitive function of magnetization. Hence the magnitude and wide of the magnetoresistance peak and the magnetic field strength at the peak point are functions of angular orientation of both magnetic field and electric current.
THE MAGNETIC PROPERTY OF AMORPHOUS Pr-Co THIN FILMS
Authors: WAN HONG  , DAI DAO-SHENG  , FANG RUI-YI  , LIU ZUN-XIAO  ,   北京大学物理系
Published: December 2020

Amorphous thin films of PrxCo1-x alloys were prepared over the composition range 0.06-0.86 by the vacuum evaporation method with two sources. The magnetic properties of those films were measured by using extracting sample magnetometer, vibrating sample magnetometer and the alternating susceptibility set. The dependence of magnetization of these films on temperature and field were studied. It was found that the magnetization has a sudden drop near the temperature corresponding to the maximun of the value of the alternating magnetic susceptibility, and for samples with xco and Pr atom μpr were calculated. The effective magnetic moment of Co atom μco equals l.36f(x), where f(x) is the probability for bearing magnetic moment of cobalt atoms. The effective magnetic moment of Pr atom equals 1.6 μB in. the composition range 0-40% and decreases rapidly in the range 0.4-0.86.
LOCAL APPROXIMATION APPROACH TO THE GROUND STATE OF THE SYMMETRIC ANDERSON LATTICE
Authors: WEI GUO-ZHU  ,   东北工学院物理系
Published: December 2020

Using the Green function technique, the H-F ground state energy of the symmetric Anderson lattice is caolulated. Then the correlation energy, ground state energy, local moments, charge-and Spin-fluctuations of the correlation ground State are caclulated with the local approximation. Corresponding analytical formulas are obtained for a rectangular density of state. The result indicates that local moments decrease with decreasing value of the one-site f-f coulomb interaction U and or increasing value of the d-f hybridization strength V.
HOPF BIFURCATION FROM STEADY STATE OF DISSIPATIVE THREE-WAVE INTERACTION
Authors: HE KAI-FEN  ,   北京师范大学低能核物理研究所
Published: December 2020

With the analysis of eigenvalues, it is found that a Hopf bifurcation would occur from the steady state of a dissipative three-wave interaction, so long as the contraction rate of its volume in phase space is low enough. The critical value of the contraction rate and the frequencies of the oscillation obtained from the eigenvalues are in good agreement with the results of solving the dynamk equations in the linear stage. It is also shown that no pitchfork bifuraction would occur.
ANTIBONDING STATE AND RELATED PROPERTIES OF Fe-ACCEPT OR IN GaP AND GaAs
Authors: HUANG QI-SHENG  ,   厦门大学物理系
Published: December 2020

By calculating the vibrational entropy change during hole transition for Fe-center, it is shown that the acceptor state of Fe-center is antibonding; The enthalpy and Gibbs free energy change and their temperature dependence caused by hole transition are calculated and compared with experimental data. From the results, it is reasonably well understood that activation energy obtained by thermal emission rate for Fe-center is always larger than that from optical measurement.
A NEW TYPE OF QUANTUM MECHANICAL AMPLIFIER ——TRANSITION BEAT AMPLIFIEP
Authors: ZHAO HONG-ZHI  , DONG TAI-QIAN  ,   北京大学无线电电子学系
Published: December 2020

In this paper, a new type of quantum mechanical amplifier using transition beat is described. At room temperature, as the bandwidth of receiver is 2 KHz, the sensitivity is 5×10-15 W.
A PROOF ON THE EQUIVALENCE OF TOPOLOGICAL ENTROPY AT SUBREGION WINDOW OF RLm
Authors: WENG JIA-QIANG  , KONG LING-JIANG  , CHEN GUANG-ZHI  ,   广西师范大学物理系
Published: December 2020

We demonstrate that topological entropy is equivalent on the whole subregion of RLm, We also show that the high-order chaotic bands give no contribution to topological entropy in these tubregions.
FOCUSING AND SCANNING PROPERTIES OF ACOUSTIC BEAM IN SOLID USING A FRESNEL ARRAY
Authors: WU JIN-YUAN  , WANG CHENG-HAO  , HE QI-GUANG  ,   中国科学院声学研究所
Published: December 2020

The scanning and focusing of acoustic beam in solid by a Fresnel transducer array of planar structure is significant in many applications.In this paper, the acoustic field distributions of such beam were analysed by using the scalar theory and vector theory respectively. The theoretical analyses have been compared with experimental results.Finally, for the purpose of RF spectrum analysis, the transient time and the weighting of such focusing beam were discussed.
THE EFFECT OF Er3+ CONCENTRATION ON ALTERNATING CURRENT ELECTROLUMINESCENCE CHARACTERISTICS OF ZnS:ErF, THIN FILMS
Authors: MENG LI-JIAN  , LI CHANG-HUA  , ZHONG GUO-ZHU  ,   中国科学院长春物理研究所
Published: December 2020

In this paper, we have studied the effect of Er3+ concentration ACEL characteristics of ZnS:ErF3 thin films. It is shown that I(4F9/2→4I15/2) increase with increasing Er3+ concentration. By studying the EL decay, the ratio of green to red emission vs applied voltage and EL efficiencies of 4F9/2 and 2H11/2+ 4S3/2 energy levels of ZnS:ErF3 thin films with different Er3+ concentration, we find that the increase of I(4F9/2→4I15/2) is due to the cross-relaxation processes occurred between Er3+ ions. The cross-relaxation rate increase with increasing Er3+ concentration, and results in the increase of I(4F9/2→4I15/2).
TWO-BODY CORRELATION FOR THE EXCITED STATES OF THE ATOMS
Authors: FAN YONG-CHANG  , LI MING-SHENG  , LI BAI-WEN  ,   中国科学院武汉物理研究所
Published: December 2020

The variational approach to two-body correlations in atoms proposed by Wilets et al, and developed by bresent authors is applied to treat the correlations of excited states of the atoms. The (ls)(nl)1,3L excited states of helium iseelectronic sequence, the (1s)2(2s)(nl)3L states of beryllium isoelectronic sequence and the (1s)2(2s)2(nl)2L states of boron have been calculated.The results show that these correlation wave functions have simple structure and are feasible in caloulation application. The accuracy of our method is very close to those of more complicated CI and 1/Z perturbation expansion methods.
INVESTIGATION OF FLUORESCENT CHARACTERISTIC IN Nd:YAG SINGLE CRYSTAL FIBERS
Authors: SUN PING  , M. J. F. DIGONNET  ,   (1)美国Litton公司; (2)清华大学无线电系
Published: December 2020

The fluorescent characteristic in Nd: YAG single crystal fibers has been investigated. One rod and four claded fibers produced with MPG process were tested, of which the diameters ranged from 41 micron to 120 micron with variations less than 0.5%. Excited by 300 milliwatt power laser at 0.6 micron, the fluorescence amplification at 1.06 micron was observed. The analysis predicted the condition and capability of superfluorescence.
A COMPUTATIONAL METHOD OF TEMPERATURE CHARACTERISTICS OF MAGNETO-OPTIC POLAR KERR ROTATION ANGLE
Authors: JIANG QI  , SHEN DE-FANG  , GAN FU-XI  ,   (1)中国科学院上海光学精密机械研究所; (2)中国科学院上海冶金研究所
Published: December 2020

A new computational method which can easily evaluate the relationship between the magneto-optic Kerr rotation angle θK and temperature T is presented. As a practical example, using this method, we have obtained the numerical solution for the preferential quadrilayer structure, the solution is in good accordance with the experimental results. On the basis of the best reading laser power derived by this method, the optimum signal to noise ratio of the optic disk can be obtained.
THE INFLUENCE OF TEMPERATURE ON ORDINARY HARD BUBBLES
Authors: HUO SU-GUO  , NIE XIANG-FU  , HAN BAO-SHAN  ,   (1)河北师范大学物理系; (2)中国科学院物理研究所
Published: December 2020

The influence of temperature on ordinary hard bubbles and their corresponding hard stripe domains in epitaxial garnet bubble films was investigated experimentally, A critical temperature T0, which is related to the parameters of bubble films, was found. When the testing temperature T0, the VBL chains in hard domain walls are not changed after temperature increasing and then decreasing. When T>T0, however, the VBL chains disappear, so that all of hard domains become soft. When VBLs in walls are compressed, the harder the domain, the lower its softening temperature. During softening, the way of VBL disappearance is a sudden break down of the whole chain.
ELECTRONIC STRUCTURE and PHASE IN VAl
Authors: XU JIAN-HUA  ,   中国科学院上海冶金研究所
Published: December 2020

The results of the total energy calculation showed that in VA13 the tetragonal D022 phase (structure) is energetically favored as compared to the cubic L12 phase, this consists with experiment. In addition, the density of states at EF in D022 phase is two orders of magnitude smaller than that in the L12 phase.
A COMPUTER SIMULATION OF THE STRUCTURE OF AMORPHOUS ALLOY Fe-P(II)——THE DEPENDENT RELATION OF THE STRUCTURE OF Fe100-xPx ON THE CONCENTRATION
Authors: WANG XU-WEI  , CHEN JIN-CHANG  , SHI SHUANG-HE  ,   (1)北京航空学院应用数理系; (2)北京师范学院物理系
Published: December 2020

In this paper, the model that we constructed to simulate the DPRHS of Fe100-xPx(x= 25, 20, 15) is taken as the primary configuration. This configuration is then subjected to relaxation under the quasi-dynamical equilibrim boundary through the tail truncated Morse potential (energy minimization). The total energy, reduced distribution function, coordination number distribution, angular distribution and homogeneity are obtained from the calculated data. The dependent relation of the structure of Fe100-x Px on the composition are discussed.
PROPERTIES OF CO-ADSORPTION OF K WITH O ON Ag(110) SURFACE STUDIED BY XPS, UPS, EELS AND LEED
Authors: WU MING-CHENG  ,   复旦大学表面物理实验室
Published: December 2020

The properties of co-adsorption of K with O on the Ag(ll0) surface have been investigated with X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), electron energy loss spectroscopy (EELS) and low energy electron diffraction (LEED). It is shown that, at low potassium coverages, there are two distinct oxygen species on the Ag(ll0) which are determined as the dissolved and chemisorbed atomic oxygen species. With K coverage increasing, the molecular oxygen is developed, which is associated with subsurface K. These oxygen species peaks can be clearly distinguished from UPS as well as XPS. The initial sticking coefficient of the K precovered Ag surface for oxygen adsorption is enhanced. K and O display a mutual enhancement of surface to bulk transport. A monolayer K atoms forms (1×2) LEED pattern on the Ag(ll0) surface, which is consistent with the early results. The surface structure, however, transfers into a (2×1) ordered structure when oxygen is exposed to the surface. A mode] for co-adsorption of K with O on the Ag(ll0) is proposed.
ON THE MOBILITY EDGES IN A ONE-DIMENSIONAL INCOMMENSURATE SYSTEMS
Authors: LIU YOU-YAN  , ZHOU YI-CHANG  ,   (1)华南理工大学物理系; (2)中山大学物理系
Published: December 2020

The succesive average resistivity criterion for localization has been used to study the Sou-koulis-Economou model of one-dimensional systems with incommensurate potentials. It is found that when wave vector Q = 0.7, all electronic states of the three subbands in the middle are extended and there exist no so-called "local mobility edge".
M?SSBAUER STUDY ON CHANGES OF THE MAGNETIC ANISOTROPY AND THE CRYSTALLIZATION IN ANNEALED AMORPHOUS ALLOY Fe81B13.5Si3.5C2
Authors: XU ZU-XIONG  , MA RU-ZHANG  ,   北京钢铁学院
Published: December 2020

Changes of the magnetic anisotropy and its correlation with both surface and bulk crystallizations are studied with M?ssbauer spect scopy and X-ray diffraction for amorphous alloy Fe81B13.5Si3.5C2 annealed in the air. It is shown that abnormal changes of the magnetic anisotropy as annealing in the air is correlated with the development of surface crystallization into bulk process.
MEASUREMENTS OF TOTAL ELECTROOPTIC COEFFICIENTS OF KTiOPO4 CRYSTAL
Authors: YIN XIN  , WANG JI-YANG  , LIU YAO-GONG  , WEI JIN-QIAN  ,   山东大学晶体材料研究所
Published: December 2020

Total electrooptic coefficients of KTiOPO4 crystal have been measured by interferometric method. The results obtained are:γ13 = 7.9, γ23= 11.3, γ33= 22.7, γ51=10.6 and γ42= 6.2(×10-10cm/V).
CRYSTAL STRUCTURE AND SUPERCONDUCTIVITY OF Bi2Sr2CaCu2O8 COMPOUND
Authors: LIANG JING-KUI  , XIE SI-SHEN  , CHE GUANG-CAN  , HUANG JIU-QI  , ZHANG YU-LING  , ZHAO ZHONG-XIAN  ,   中国科学院物理研究所
Published: December 2020

The crystal structure of the ideal composition compound Bi2Sr2CaCu2O8 with zero resistance temperature Tc(0) = 81.4K had been determined by X-ray powder diffraction method. The basic structure of this compound exhibits tetragonal symmetry with lattice constants a = 3.825 ?, c = 30.82 ?. The most probable space group is D4h17-14/mmm, Each unit cell contains two formula units. The arrangements of atoms in the unit cell are as follows:2Ca cations occupy 2(a) equivalent point position; 4Sr, 4Bi and 4Cu cations occupy the same equivalent point position 4(e) with respective parameters z= 0.110, 0.302, 0.445; 16O anions respectively occupy 8(g) (z = 0.445) and two 4(e) equivalent point positions (z= 0.210 and z = 0.380), The crystal structure of Bi2Sr2CaCu2O8 can be derived from Aurivillius type structure. The main feature of the structure is alternate arrangement of cations along (00z) and (1/2, 1/2, z) of tetragonal system. The other possible superconducting phases in the Bi-Sr-Ca-Cu-O system can be considered as the structure having different stacking layers along z axis.
A STUDY ON THE MAGNETIC PROPERTIES OF SURFACE OXIDE LAYERS OF ULTRAFINE IRON PARTICLES
Authors: WU JIAN  , LU HUAl-XIAN  , DU YOU-WEI  , GAO XUE-KUI  , WANG TING-XIANG  ,   南京大学固体微结构实验室物理系
Published: December 2020

The dependence of σs of ultrafine iron particles on their average diameter d is measured. It is found that the smaller the particles, the smaller their σs. The variation of σ with temperature, σ(T), which is irreversible, is also measured both in temperature rising and dropping processes. The experimental results can be explained by spin pinning in the oxide layers.
STUDY OF DENSITY PROFILE STEEPENING AND HOLLOWING IN LASER-PRODUCED PLASMAS
Authors: JIANG ZHI-MING  , XU ZHI-ZHAN  , ZHANG WEI-QING  , LIN LI-HUANG  , CHEN SHI-SHENG  ,   (1)中国高等科学技术中心(世界实验室)凝聚态与辐射物理分中心; (2)中国科学院上海光学精密机械研究所
Published: December 2020

Using interferometric diagnostics by visible probing beam, we have studied the electron density profiles in coronal plasmas of solid targets irradiatied by Nd glass laser at an intensity of 1014 W/cm2. We have observed not only the phenomena such as density steepening and hollowing due to light pressure, but also different characters of density hollowing in various configuration targets.
THE MAXIMUM DIFFRACTION EFFICIENCY FOR HOLOGRAPHIC STORAGE IN PHOTOREFRACTIVE CRYSTALS
Authors: YUE XUE-FENG  , SHAO ZONG-SHU  , CHEN HUAN-CHU  , WANG YING-SU  ,   山东大学
Published: December 2020

In this work, the relations between the diffraction efficiency of recorded holograms in photorefractive crystals and the ratio of writing beam intensities are analyzed, the condition corresponds to the maximum diffraction efficiency is obtained and an experiment is carried out to prove the conclusions.
MAGNETIC PROPERTIES AND VARIABLE VALENCE OF Pr ATOM FOR THE AMORPHOUS RE-TM THIN FILMS (RE=Nd, Pr, TM=Fe, Co, Ni)
Authors: WAN HONG  , DAI DAO-SHENG  , FANG RUI-YI  , LIU ZUN-XIAO  , LAN JIAN  ,   北京大学物理
Published: December 2020

Through the investigation of the low temperature magnetic properties for the amorphous light rare-earth (Pr, Nd) and transition metal (Fe, Co, Ni) alloy thin films, the composition dependence of the magnetic moment for each of Pr, Nd, Fe, Co and Ni atoms in these alloys can be determined. We found that the delocalization of 4f electron of Pr atom may be studied by analyzing the variation of the magnetic moments of the Fe, Ni and Pr atoms with presence of the Pr component.
THE INFLUENCE OF MO2, M2O5 AND MO3 OXIDES ON THE CONDUCTIVITY OF LITHIUM BORATE GLASSES
Authors: HUANG PENG-NIAN  , HUANG XI-HUAI  ,   中国科学院上海硅酸盐研究所
Published: December 2020

The total conductivity and the electronic conductivity of 45Li2O·50B2O3·5MmOn (M= Al, Ti, Zr, P, V, Nb, Ta, Cr, Mo, W) glasses are measured. The Raman spectra of the glasses are studied. The influence of MO2, M2O3 and MO3 oxides is discussed based on the pro-perties of the negatively charged groups acting as the localization sites for Li+ ions.
CORRELATED-BASIS-FUNCTION THEORY FOR EXCITED STATES
Authors: SHUAI ZHI-GANG  , SUN XIN  , FU ROU-LI  ,   (1)复旦大学物理系; (2)南京大学固体微结构物理实验室; (3)中国科学院上海技术物理研究所红外物理开放研究实验室
Published: December 2020

We developed a many-body method to calculate the electron correlated basis function of excited state. Based on the Chakravarty-Woo equation and functional expansion and convolution approximation, we got the linear integral iteration equation for the variation of density and correlation function, so the wave function, due to electron excitation. A general formula for excitation energy in many-body problem is obtained From this and the known experimental data, we found the energy gap and electron correlation in 1-d conducting polymer. The result is in good accordance with the experiment.
PHOTOREFLECTANCE SPECTROSCOPY OF MBE GaAs1-x Sbx/GaAs STRAINED LAYER QUANTUM WELL
Authors: CHI JIAN-GANG  , ZHAO WEN-QIN  , LI AI-ZHEN  ,   (1)宁波师范学院物理系; (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; (3)中国科学院上海冶金研究所
Published: December 2020

The MBE GaAs1-xSbx/GaAs strained layer quantum well has been investigated by means of photoreflectance measurement. The energy band structure has been estimated by theoretical fitting with the experimental results. We confirmed that the variations of band structure caused by hydrostatic component of the strain mainly exist in conduction band, and that MBE GaAs1-xSbx/GaAs strained layer quantum well is a typical one of type Ⅱ. The theoretical estimation coincide well with our experimental results.
RESEARCH ON DEFOCUS APPROXIMATION OF OPTICAL FOURIER TRANSFORM AND DECONVOLUTION
Authors: CHEN YAN-SONG  , ZHENG SHI-HAI  , MA XUE-BING  ,   中国科学院物理研究所
Published: December 2020

In this paper, the approximation of optical Fourier transform in the cases of defocus is studied, and the relation of condition required for the defocus approximation of Fourier transform is derived. From this principle a method of using the defocus approximation is described for deblurring an electronic micrographic image, which makes the optical deconvolution process significantly simplified. The experimental results show that the quality of the image of an amorphous carbonic film is notably improved.
RELATIONSHIP BETWEEN NEW DONOR AND OXIDE PRECl-PITATES IN ANNEALED CZ-SILICON
Authors: LI JIA-QUAN  , XIAO ZHI-GANG  , KE JUN  ,   (1)北京科技大学材料物理系; (2)北京科技大学材料物理系,南京轧钢总厂经济发展部
Published: December 2020

New donor and oxygen precipitate in CZ-silicon are studied by means of Hall measurement, IR measurement and TEM observation. Two types of defect are observed in specimens annealed at 650-750℃, that is, rod-like defects and plate-like defects. New donor generation is mainly related to the plate-like defects, which are indentified as β-cristobalite according to the H-REM results. It is suggested that the new donor originates from the ionization of dangling bonds of silicon atoms on precipitates/matrix interfaces and is controlled by the neucleation and growth of β-cristobalite precipitates.
THE METHOD OF LOGARITHMIC STRAIGHT LINES OF ESR SPECTRA FOR STUDY ON STRUCTURAL PHASE TRANSITION OF ZnS:Mn
Authors: HOU BI-HUI  , GUO CHANG-XIN  , LI BI-LIN  , JIN SI-ZHAO  , QU BAO-JUN  , LIANG REN-YON  , KUI JIAN-YUN  ,   (1)中国科学技术大学结构分析中心; (2)中国科学技术大学物理系
Published: December 2020

This paper reports a method of logarithmic straight lines of electron spin resonance (ESR) spectra which has been used to detect the phase transition temperature of Zns:Mn. This experimental analysis gave satisfactory results in the study on influence of trace dope on the phase transition temperature of ZnS crystallite. The difficulty that experiments of X-ray diffraction can not distinguish the phase transition temperatures of ZnS with Mn2+ concentration in the range of 10-3-10-6 gram/gram, had been surmounted.
A NEW MODEL FOR Ta2O5/Ta INTERFACE ANALYSIS
Authors: LU MING  , ZHANG QIANG-JI  ,   复旦大学现代物理研究所
Published: December 2020

The depth profile of interface of Ta2O5/Ta sample has been investigated and a new model to explain the profile data based on the altered layer induced by bombardment of energetic ions during the sputtering has been proposed successfully. The experimental data can be fitted very well and the parameters characteristic of the ion mixing and pile up effect can also be obtained by this model. The samples were prepared by the method of anodic oxidation with a thickness of 500?. All the surface analyses were performed by scanning Auger microprobe model PHI-590 at room temperature. The following results have been obtained: In contradiction with the generally accepted point of view, the depth profile curve dose not exhibit the form of error function. The dominant factor for Auger signal during the interface analysis is the altered layer with a thickness of 30-50? rather than the electron mean free path λ. And the depth profile resolution of interface analysis is determined by compromise between the ion mixing and pile up effect.
THE MODIFICATION OF K-SHELL IONIZATION PROBABILITY THROUGH 2.52 MeV RESONANCE ON 56Fe
Authors: XU JUN-SHAN  , ZHANG CHENG-TENG  , GUO ZHEN-DI  , YANG FU-JIA  ,   复旦大学原子核科学系
Published: December 2020

This paper presents the experimental result of K-shell ionization probability over 2.52 MeV p-wave narrow resonance in the reaction of 56Fe(P, P0)56Fe. The 50% modification of KX-ray emission probability on resonance relative to off resonance has been clearly observed. It indicates that with the ratio UK/Γ as large as 5.3, the interference between the incoming and outgoing target K-shell ionization amplitudes in an atomic collision still exists. From the comparison of calculation based on theoretical formula of Blair and Anholt with the experimental result. The imaginary part of the atomic monopole amplitude Imb0 was deduced and the R0=Imb0/Reb0 was obtained as +1.8.
EXCITED STRUCTURE OF ATOMIC IONS
Authors: BAO MIN-QI  , TONG XIAO-MIN  , LI JIA-MING  ,   (1)漳州师范学院; (2)中国科学院物理研究所
Published: December 2020

We apply atomic relativistic self-consisent-field theory to calculate the quantum defects for s, p, d, f and g partial waves for atomic ions with atomic number 2≤Z≤95. The dependence of the quantum defects on the atomic number, ionicity and orbital energy is analyzed. Electronic structure of atomic ions is investigated. Based on this work, the corresponding data base of quantum defects for atomic ions can then be constructed.
THE TWO-DIMENSIONAL PHASE RETRIEVAL PROBLEM IN NON-UNITARY TRANSFORM SYSTEM
Authors: WANG LI  , DONG BI-ZHEN  , YANG GUO-ZHEN  ,   中国科学院物理研究所
Published: December 2020

The two-dimensional phase retrieval problem involving a non-unitary transform system with liffraction loss has been discussed. By means of our iterative algorithm, the phase distributions of five aberration functions have been recovered with the random distributions as initial input. The phase solutions agree with the true phases perfectly even though a heavy diffraction loss exists.
FEATURES OF ELECTRON DENSITY AND TIME-RESOLVED X-RAY SPECTRA FROM LATERAL JET NOZZLE OF Mg MICROTUBE TARGET
Authors: ZHANG HUI-HUANG  , LIN ZUN-QI  , HE XING-FA  , ZHANG ZHENG-QUAN  , WANG XIAO-QIN  , LU QI-RONG  , GU ZHONG-MIN  , ZHUANG YU-FEI  , CUI JI-XIU  , YU WEN-YAN  , LI JIA-MING  , GONG MEI-XIA  , ZHANG XIAO-QIU  , LEI ZHI-YUAN  , YANG BIN-ZHOU  , ZHAO WEI  ,   (1)中国科学院上海光学精密机械研究所; (2)中国科学院物理研究所; (3)中国科学院西安光学精密机械研究所
Published: December 2020

The 1.06 μm laser with irradiance 3.5×1013W/cm2 was injected into Mg microtube target with lateral jet nozzle. The temporal evolution of X-ray spectra emitted from Mg10+ and Mg11+ ion along the side-blow direction was recorded by using X-ray streak camera. The results demonstrate that three-body recombination is the main mechanism to realize the strong population inversion between the excited state energy levels Is4p and Is3p of Mg10+ ion. The electron density in lateral jet nozzle measured by a 2660? UV laser probe coincides with density results deduced from the spectrum information.
EXPECTATION TO THE TEST IN BEIJING FOR ANISOTROPY OF THE LIGHT VELOCITY (ON GENERAL RELATIVITY AND METRIC THEORIES)
Authors: CUI SHI-ZHI  ,   中山大学
Published: December 2020

On the basis of general relativity and metric theories of gravity, the expectation to the test in Beijing for anisotropy of the velocity of light was evaluated. The conclusion is that, according to this test, no judgement can be made bewtecn the viewpoint of conventional general relativity and that proposed in ref. [1].
DETERMINATION OF CRITICAL FIELD STRENGTH IN ELEC-TRONEGATIVE GAS MIXTURES
Authors: LI ZHENG-YING  ,   华中理工大学
Published: December 2020

Presented in this paper are two methods used for determining the critical field strengths in electronegative gas mixtures. One of the two methods is to use the predischarge parameters of the gases for the determination of the mixtures with any concentrations. And the other is to use the recordings of the electron current waveforms in the gas mixtures studied in a discharge chamber. The critical strengths in mixtures of SF6 and N2 were determined by the two methods and good agreement has been achieved.
THEORETICAL STUDY ON THE MOLECULAR NEAR-THRESHOLD STRUCTURE
Authors: TONG XIAO-MIN  , LI JIA-MING  ,   中国科学院物理研究所
Published: December 2020

Excited molecular structure in gas phase usually consists of two types of energy states: Rydberg states with diffused molecular orbitals and valencetype excited states with rather localized molecular orbitals. Excitation from molecular inner-shell orbitals into the above-men-rioned excited orbitals leads to near-threshold structures. Based on the multiple-scattering self-consistent field theory, we have studied the molecular near-threshold structure. Our theoretical results are in good agreement with experimental measurements. We have also elucidated:(1) The dynaimcal interaction between the excited electron with the residual molecular ion.(2) Physical orgin of the shaperesonance, namely, as an anti-bonding state embedded in the continuum.
STUDY ON THE SURFACE PROPERTIES OF AlxGa1-xAs(100)
Authors: HUANG CHUN-HUI  , LU XUE-KUN  , DING XUN-MIN  ,   复旦大学表面物理实验室
Published: December 2020

The surface states of Al0.7Ga0.3 As(l00) were studied by ultraviolet photoelecton spectro-scopy. It was found that there exist two surface states on Al0.7Ga0.3 As (100) surface, which could be removed by the adsorption of 1500 L hydrogen. The evolution of these two surface states with thermal annealing was investigated. Combining with the experimental results of LEED and XPS, it was recognized that the damage of surface could be removed effectively by a thermal annealing at a temperature near 450℃, and a nearly perfect surface of A10.7Ga0.3 As(l00) could be obtained.
THE TRANSVERSE RELAXATION TIME MEASUREMENT FOR RAMAN MODE BY NONDEGENERATE FOUR WAVE MIXING
Authors: FEI HAO-SHENG  , ZHANG YON  , HAN LI  , ZHAO FENG  , WEI ZHEN-QIAN  ,   (1)吉林大学物理系; (2)吉林大学物理系,哈尔滨工业大学; (3)吉林大学物理系,黑龙江大学
Published: December 2020

The transverse relaxation time measurement for Raman mode by Raman enhanced nonde-generate four wave mixing (RENFWM) has been made in the frequency domain. We get spectra of RENFWM that the nonresonant background is suppressed. The transverse relaxation time of Raman mode in benzene and methlybenzene is obtained as 1.5 ps and 2 ps respectively.
THERMAL EFFECTS IN Nd:GLASS SLAB LASERS
Authors: HUANG GUO-SONG  , ZHANG GUO-XUAN  , GU SHAO-TING  , GU GEN-CAI  , ZHU CONG-SHAN  ,   中国科学院上海光学精密机械研究所,上海,201800
Published: December 2020

In this paper, the characters of thermal fracture and optical distortion pump-induced in Nd: glass slab lasers are described. Both the calculation formulas and the experimental results are given. The calculation results are well consistent with the experiments.
EDGE DISLOCATION IN CRYSTAL DEFECT GAUGE FIELD
Authors: GAO FEI  ,   兰州大学材料科学系,兰州730000
Published: December 2020

In this paper, the strain and stress field produced by an edge dislocation are expressed by means of continuous dislocation distribution. The stresses inside and outside the core of the edge dislocation are obtained. The dislocation distribution of infinitesimal strength is expressed by crystal defect gauge field, which are calculated under certain gauge condition. In side the core, the stresses are finite when r goes to zero. The singularity of stresses is removed. Finally, the energy of the edge dislocation are calculated.
DIRECT ATOMIC IMAGING OF THE FORMATION OF A 60° DISLOCATION ON THE (111) SURFACE OF Tb4O7
Authors: NING XTAO-GUANG  , YE HENG-QIANG  ,   中国科学院金属研究所固体原子象开放研究实验室,沈阳,110015
Published: December 2020

Clean surfaces of Tb4O7 crystal have been studied by a surface profile imaging technique cm the atomic scale. The formation of a 60° mixed dislocation due to electron radiation on the(111) surface was observed in-situ.