bluuebunny/crossref_metadata_2025 huggingface dataset:
A ASED-MO STUDY OF THE MICRO MECHANISM OF ACTIVATION OF CO ADSORBED ON Ni(100)AND POISONING BY THE SUBMONOLAYER S ATOM
Authors: CAO PEI-LIN  , SHI DAN-HUA  ,   浙江大学物理系
Published: December 2020

Using an atom superposition and electron delocalization molecular orbital (ASED-MO) theory, the micro-mechanism of activation of CO adsorbed on Ni(l00) and of poisoning by submonolayer S atom is studied. CO is found to bond to the top site more strongly than on the fourfold site. When CO is adsorbed on the top site, it will get 0.72 e on its antibonding 2π orbital, and its dissociation energy will reduce from 11.1 eV for free CO molecule to 2.15 eV. If CO is adsorbed on the fourfold site, the electrons on its 2π orbital will be 1.22 e and dissociation energy 1.85 eV. It seems likely that CO adsorbed on fourfold site is more active. Our binding energy calculations have verified that one S atom adsorbed on Ni(l00) will inhibit 4 nearest top sites and 4 nearest fourfold sites from adsorbing CO molecule, but will not give any important affection on farther sites. These results support the idea that the dominant effect of adsorbed S atom is "structural effect". These "blockage" effect by the adsorbed S atom, i.e. the reduction of the active sites, and some other factors, result in the poisoning of Ni sur-faces by submonolayer S atom.
INVESTIGATION OF CO AND NO CHEMISORPTION ON THE Ⅷ GROUP TRANSITION METAL SURFACE BY Xα-DV METHOD(Ⅱ)——CHEMISORPTION OP NO ON PD(111) SURFACE
Authors: WU YUE  , CAO PEI-LIN  , CHEN YUN-QI  , ZHENG DE-JUAN  ,   (1)浙江大学物理系; (2)中国科学院物理研究所
Published: December 2020

The Chemisorption of NO on Pd (111) surface is calculated using Xα-DV method. It's electronic structure, including spectrum of the ground state valence levels, density of states, and the charge transfer between adsorbate and substrate, is obtained. The interaction between adsorbed NO molecules is included in our calculations. The results of DOS are in good agreement with UPS, supporting the LEBD structural analysis, and the adsorption height is determined to be 1.27 ?. Our theoretical results have verified that the interaction between NO is rather important in the chemisorption of NO on Pd surfaces. The activation of adsorbed NO on Pd(lll) is discussed. It is evident from our results that the charge transfer between adsorbed NO and substrate is similar to CO adsorption on transition metal. Finally, we found that the adsorption of NO does not significantly affect the valence band of Pd.
PRESSURE EFFECT ON THE STABILITY AND PHASE TRANSFORMATION OF THE ε-PHASE IN SPLAT QUENCHING Fe-C-Sb ALLOY
Authors: QIN ZHI-CHENG  , CHEN XI-CHEN  , HE SHOU-AN  , WANG WEN-KUI  ,   中国科学院物理研究所
Published: December 2020

Pressure effect on the phase transformation process of the ε-phase of splat quenching Pe-C-Sb alloy has been investigated by using X-ray powder photography. The experimental results show that high pressure will not only increase the stability of the ε-phase remarkably but also change its phase transformation process. At 4.7 GPa, as the temperature of stability of ε-phase increases to 450℃, a new metastable phase of orthorhombic structure, being absent at normal pressure, will appear. By raising annealing temperature to 560℃, the orthorhombic metastable phase begins to transform into Fe3C which will decompose into carbon (graphite) and γ-Fe on further increasing annealing temperature to 800℃. At this time, the alloy is composed of C (graphite), γ-Fe, Sb and another unknown phase.
PYROELECTRIC PROPERTIES OF METHYL P-HYDROXYBENZOATE CRYSTALS (P-MHB)
Authors: SHI ZI-KANG  , LI ZHENG-DONG  ,   中国科学院福建物质结构研究所
Published: December 2020

The methyl P-hydroxybenzoats cryslal is a organic pyroelectric crystal. A thorough experimental study has been carried out on its pyroelectric effect, electric condutance, hysteresis loop and other relevant properties.
THE INTERACTION PICTURE IN THE CLOSED TIME PATH GREEN'S FUNCTIONS
Authors: XU HONG-HUA  ,   上海市普陀区业余大学
Published: December 2020

It is clarified that the interaction picture introduced in CTPGF ought to be the incoming one and the perturbation expansion of CTPGF to be developed also in this sense.
XPS AND AES STUDY OF AlxGa1-xP SOLID SOLUTIONS
Authors: ZHONG ZHAN-TIEN  , XING YI-RONG  , TU XING-ZHENG  ,   中国科学院半导体研究所
Published: December 2020

The solid solution AlxGa1-xP(0≤x≤0.64) has been investigated by XPS and ABS.The experimental results show that the binding energy of P21, core level decreases and the top of the valence band recedes with increasing Al-content. Moreover the weak Auger peaks of GaP have been identified and clarified.
IS VPd3 A WEAK ITINERANT FERROMAGNET?
Authors: XU JIAN-HUA  ,   中国科学院上海冶金研究所
Published: December 2020

The electronic structure and the X-ray photoemission spectrum for VPd3 were calculated using the self-consistent LMTO method. The general feature and the peak positions of the density of states were in reasonable agreement with Williams et al. Contrary to their result μs～1.4μB for VPd3, the calculated Stoner parameter for VPd3 is 1.04, which indicated that VPd3 may be considered as one of the weak itinerant magnets likely. Nevertheless, a discrepancy between ours and Burmester et al., who found no evidence for magnetic ordering in VPd3 down to 1.6 K, remained to be solved.
MONTE-CARLO SIMULATION OF PARTICLE CONFINEMENT IN MIRRORS WITH SPACE-VARING MAGNETIC FIELD
Authors: Wang Long  ,   中国科学院物理研究所
Published: December 2020

The particle confinement has been studied by Monte-Carlo simulation in the intermediate regime between the collisional and collisionless regimes for the mirrors with space-varing magnetic fields, for example, LAMEX and parabolic magnetic field profiles. The particle confinement time in the intermediate regime is longer than the extrapolation values based on the formulas in other two regimes, and proportional to the mirror ratio. The density profiles have been obtained as self-consistent solutions from the simulation. The dependence of the density profile on the plasma parameters are discussed.
LOW FREQUENCY ABSORPTION BAND IN Hg1-xCdxTe
Authors: Fu Rou-li  ,   中国科学院上海技术物理研究所
Published: December 2020

A new interpretation on the low frequency absorption band in Hg1-xCdxTe is presented.By the calculation of the vibrational spectra of CdTe (or HgTe) diatomic chain with one substitutional impurity Hg (or Cd), and the discussion of the characteristic of vibrational modes in the mixed crystal Hg1-xCdxTe, ive show that there exist acoustic phonons, the frequency of which doesn't approach zero at k→0. These acoustic phonons can absorb the photons in far infra red range and cause the low frequency absorption band. The characteristics of low frequency absorption band reported so far can thus be interpreted. We also predict that there may exist similar low frequency absorption band in the other mixed crystals, the optical phonons of which have "two-mode" behaviour.
INVESTIGATION ON ABSORPTION EDGE OF LiNbO3 CRYSTALS WITH DIFFERENT COMPOSITIONS
Authors: Liu Si-min  , Zhang Guang-yin  , Cuo Jian-bin  ,   南开大学物理系
Published: December 2020

In this paper, it is affirmed that the absorption edge below 3.8 eV is attributable to indirect transition, the rational ownerships of three straight-line parts of spectral line are obtained by studing the a1/2-hν curve of LiNbO3 crystals with different compositions. According to the relation between LiNbO3 lattice constant and compositions, we are sure that the energy band structure change with composition. Redfield's and ours expermental results of absorption edge are explained.
A NEW CRITERION OF CONSTRUCTING THE STRUCTURAL MODEL OF BINARY AMORPHOUS ALLOYS
Authors: Wang Jing-han  , Cheng Xian-an  , Wang Xu-wei  , Chen Bing-yu  , Li De-xiu  , Chen Jing-chang  ,   (1)北京航空学院应用数理系; (2)北京师范学院物理系; (3)云南大学物理系
Published: December 2020

The relative distribution of the metalloid atoms is one of the most important characteristic of the chemical short-range order in the structure of the amorphous alloys consist of metal-metalloid. Basing on this idea, a new criterion of constructing the structural model of this kind of alloys is proposed, and several models are made by a computer with this new criterion, which simulate the structures of amorphous alloy Ni64B36,Fe80B20,Ni81B19 and Co81P19 respectively. All of the partial distribution functions of these models are in agreement with the experiments. These results are also compared with other author's works and discussed.
ASYMPTOTIC BEHAVIORS OF WAITING TIME DISTRIBUTION FUNCTION (WTDF) ψ(t) AND ASYMPTOTIC SOLUTIONS OF CONTINUOUS-TIME RANDOM WALK (CTRW) PROBLEMS
Authors: DENG HUI-FANG  ,   江西师范大学物理系
Published: December 2020

In this paper, a new waiting time distribution function (WTDF), ψ(t), is adopted to discuss asymptotic solutions of the continuous-time random walk (CTRW) problems. This WTDF is not purely exponential and is universally valid for explaining the low-frequency (say, ω<10GHz) fluctuation, dissipation and relaxation properties of condensed matter. Many theoretically meaningful results are obtained, and they are in agreement with experiments, These results include the mean displacement, the dispersive mobility, the meansquared displacement, the dispersive diffusion coefficient, Nernst-Einstein relation, the variance and the standard variance, the lattice statistics, the initial site occupation probability, the dispersive conductivity, the dispersive electrical transport and the memory function. All results show that the CTRW process described by the WTDF ψ(t) behaves as non-Markovian over the very broad time domain and as Markovian only in long time limit, this is to say all results contain a single parameter, n, the infrared divergence exponent, which depends on the microscopic structure of condensed matter and determines the degree of dispersion. The larger the value of n is, the stronger the dispersion becomes. When n= 0, the dispersion disappears and all results reduce immediately to the classical Markovian forms.This is in agreement with receat experimental facts.
ELECTRONIC STRUCTURES OF CHALCOGENIDE PAIRS IN Si
Authors: HU WEI-MIN  , GU YI-MING  , REN SHANG-YUAN  ,   中国科学技术大学物理系
Published: December 2020

The electronic structures of the ground states of S0 Se0 and Te0 pairs in Si are invesgated using the Green's function method with a tight binding Hamiltonian. Three different opinions are discussed. (S0)2, (Se0)2 or (Te0)2 in Si will introduce a symmetrical A1g state and an anti-symmetrical A2u state in the gap, both are fully occupied, the observed state is the shallower A1g state. The theoretical reason why the symmetrical A1g, state is higher than the antisymmetrical A2u state is analysed. The measured g factor of (Se2)+ in Si and the experimental data of ESR spectra for (S2)+ and (Se2)+ in Si also support the conclusions of the present paper.
A METHOD FOR DESIGNING BROADBAND COMPOSITE PULSES IN SOLIDS
Authors: WU XIAO-LING  , WU XUE-WEN  , ZHANG SHAN-MIN  ,   华东师范大学物理系
Published: December 2020

A theory is presented for designing broadband composite pulses in solids by using perturbation method of quantum mechanics combining with coherent averaging theory. A broadband composite π pules Px(90°)Py(90°)Px(90°) is designed by this method. The experimental results that the pulse sequence is quite good.
A MICROSTRUCTURE PHYSICAL MODEL OF SENSITIVE SEMICONDUCTOR CERAMICS (Ⅱ)
Authors: NAN CE-WEN  ,   武汉工业大学硅酸盐材料科学与工程系
Published: December 2020

Following paper (I), we describe the electrical feature of thermal-sensitive, gas-sensitive and humiditysensitive ceramics by the microstructure-physical model of sensitive ceramics, and obtain some important results. These theoretical results are consistent with experiments, they provide a basis of the theory for materials design of sensitive ceramics. We expect that this model can be taken as the unified microstructure-physical model of this kinds of semiconductor ceramics.
STRUCTURE DETERMINATION OF HYDROGENATED METALLIC GLASS Ni24.3Zr75.7H0.65
Authors: HUANG SHENG-TAO  , XUE HONG-YONG  , CAO MING-ZHONG  , WANG GEN-SHI  ,   (1)南开大学物理系; (2)武汉大学物理系; (3)武汉大学物理系,现在武汉工业大学
Published: December 2020

The radial distribution function of hydrogenated metallic glass Ni24.3Zr75.7H0.65 was deter-mined with X-ray scattering technique to investigate the influence of hydrogcnation on the structure of metallic glass Ni24.3Zr75.7 and the local surroundings of hydrogen atoms in the struc-ture of metallic glass Ni24.3Zr75.7H0.65.
THE REFRACTIVE INDICES AND NONLINEAR OPTICAL PROPERTY OF KIO3 CRYSTAL
Authors: YIN XIN  , Lü MENG-KAI  , CHENG DUAN-PING  ,   山东大学晶体材料研究所
Published: December 2020

The refractive indices of unpolarized KIO3 crystal in three different directions have been measured in the range of visible wavelength. The existence of type I phase matching surface in KIO3 crystal has been verified by experimental method. The optimum phase matching direc-tion in unpolarized KIO3 crystal has been found.
THE COMPENSATION OF DEFECTS AND DOPING IN LPCVD a-Si FILMS
Authors: ZHANG PEI-XIAN  , YAO JIE  , PENG SHAO-QI  ,   中山大学物理系
Published: December 2020

The studies for detects compensation and doping of LPCVD grown a-Si materials have been made by ESR, σD, σph, SIMS and Eα measurements. It is found that these materials can still be doped, although with no detectable hydrogen content. In particalar, the films can be doped effectually, and the Fermi level can be moved obviously toward the band edge in the heavily doped zone. In this paper, based on the new point of view about a-Si doping presented by Street recently, the mechanism for a-Si doping without hydrogen is explained in terms of defect compensation and chemical coordination.
A STUDY ON STRUCTURE AND ELECTRICAL PROPERTY OF AMORPHOUS MATERIALS IN SYSTEM AlF3-K2NbOF5
Authors: CUI HUA  , YUAN QI-HUA  , CUI WAN-QIU  ,   (1)武汉大学化学系; (2)武汉建筑材料工业学院
Published: December 2020

In this paper, the ionic conduction in the glass system AlF3-K2NbOF5 have been studied. The structure of glasses is also primarily established by Raman spectroscopy. The ionic conductivity of glasses is further discussed, based on the change of composition and structure. For glasses in system AlF3-K2NbOF5, when A1F3 content ranges from 21-26 mol%, A13+ and Nb5+ ions are in octahedral coordination, and the ionic conductivity increases with increasing AlF3 content. When A1F3 content reaches 29 mol%, A13+ ions are partly in tetrahedral coordination, and the ionic conductivity decreases. The effect is supposed to be caused by A1F4- ion tetrahedron. Because of the appearance of A1F4- ion tetrahedron, the mobile ion channels are possibly blocked. The ionic conductivity of glasses in this system is 1.045×10-2Ω-1·cm-1.at 194℃.
THE KINETIC DRIFT CYCLOTRON LOSS CONE INSTABILITIES IN AN INHOMOGENEOUS MEGNETIC FIELD
Authors: GUO SHI-CHONG  , SHEN JIE-WU  , CAI SHI-DONG  ,   中国科学院物理研究所
Published: December 2020

The kinetic effects of magnetic drift resonance on the drift cyclotron loss cone instability (DCLC) are studied in detail both analytically and numerically. It is found that the effects of inhomogeneous magnetic field in high β plasmas are important, the kinetic resonance act as a dissipative effect, which can enhance the instability and broaden the unstable region of negative energy DCLC mode. Finite β effects do not play the stabilization role predicted by the theories under the fluid approximation.
A PHENOMENOLOGICAL MODEL FOR 0- MESON (Ⅱ)——THE ELECTROMAGNETIC FORM FACTOR
Authors: WU ZI-YU  , WANG KE-LIN  , LAN HUI-BIN  , ZHANG ZHENG-GANG  , XIAN DING-CHANG  ,   (1)成都地质学院; (2)中国科学技术大学基础物理中心; (3)中国科学院高能物理研究所
Published: December 2020

The physical space-like electromagnetic form factor has been calculated directly from the Euclidean 0- meson wave functions solved for the flat bottom potential in the Euclidean space. Numerical results show that the theoretical calculation may be in accordance with experiment by appropriately choosing the parameters.
LOW TEMPERATURE GROWTH OF THIN Ge FILM ON Si SUBSTRATES BY MOLECULAR BEAM EPITAXY
Authors: ZHOU GUO-LIANG  , CHEN KE-MING  , TIAN LIANG-GUANG  ,   (1)复旦大学表面物理实验室; (2)上海交通大学应用物理系
Published: December 2020

In this paper, we report the results of RHEED, AES studies of thin Ge film grown on the patterned Si substrates which are formed by room temperature Ge deposition followed with thermal annealing to cluster the deposited Ge into islands. Double crystal X-ray diffraction measurements show that the existence of Ge islands on Si substrate surfaces is effective for releasing the mismatch strain and improving the crystalline qualities of the epilayers then deposited on it.
A POSSIBLE HIGH-Tc SUPERCONDUCTING MECHANISM
Authors: FENG SHI-PING  , MA BEN-KUN  ,   (1)北京师范大学物理系; (2)北京师范大学物理系低能核物理研究所
Published: December 2020

Using the Anderson lattice Hamiltontan, we discussed the superconducting mechanism of high-Tc superconductors. The result show that the superconductivity may be induced by the hybrid Cooper pairs of electrons between the two bands of localized and delocalized states due to strong corrlations of electrons in the band of localized states.
THE GROUND STATE OF MIXED SPIN (S=1,1/2) SYSTEM OF THE LATTICE WITH THIRD NEAREST NEIGHBORS ANTIFERROMAGNETIC INTERACTION
Authors: WANG XUAN-ZHANG  ,   哈尔滨师范大学物理系
Published: December 2020

The transformation method in reference [1] is extended to treat the lattice composed of different spin atoms (Sa=l, Sb= l/2), the ground state's spin structure, energy and phase boundary of the simply cubic lattice with ihird nearest neighbors, next nearest neighbors and nearest neighbors antiferromagnetic interaction haye been calculated in an arbitrary magnetic field. We conclude that the lattice possesses two antiferromagnetic spin structures and four subferromagnetic spin structures from the phase diagrams.
ANGULAR MOMENTUM OF SUPERELECTRONS AND THE MAGNETIC FLUX QUANTIZATION
Authors: DING XIU-XIANG  , LIANG JIU-QING  ,   山西大学物理系
Published: December 2020

It is shown that the magnetic flux quanmzation should be consistent with the angular momentum quantization of superelectrons. The fractional angular momentum would lead to the fractional quantization of magnetic flux which does not contradict the theory of superconductivity and the result of previous experiments. We propose and analyse a crucial experiment to test the fractional quantum of magnetic flux as well as any"-on"s.
PHOTOIONIZATION OF IONIZED IRON ATOMS
Authors: LIU LEI  , TONG XIAO-MIN  , LI JIA-MING  ,   (1)中国高等科学技术中心(世界实验室)理论物理分中心; (2)中国科学院物理研究所
Published: December 2020

Based on atomic self-consistent-field theory (i.e, independent electron model), we have performed non-relativistic and relativistic calcllations for photoionization cross sections of various ionized iron atoms. We focus on their dependence on the degree of ionization. Relativistic effect on photoinization of Fe is also discussed.
STUDY OF THE STRUCTURAL RELAXATION OF METALLIC GLASS (Fe0.85Ni0.15)84B16 BY MEASURING THE THERMAL EXPANSION AND RESISTANCE UNDER ZERO STRESS
Authors: YAO CI-SHUN  , CHENG XIAN-AN  ,   (1)北方工业大学; (2)北京航空航天大学应用数理系
Published: December 2020

The dependence of the structural relaxation of the material on the annealing temperature Ta is studied by measuring the difference of thermal elongation △l or that of the electrical resistivity △ρ and that of the thermal expansion coeffcient △α between an as-quenched and an annealed sample. △α/α0 is measured by placing an as-quenched and an annealed sample in juxtaposition and heating them with iodine-tungsten lamps. The samples expand freely and the rsitivity of the as-onerched sample, respeomparator. The experimental results are summarized by three curves, namely △α/α0 vs Ta, △l/l0 vs Ta and △ρ/ρ0 vs Ta, where α0, l0, and ρ0 are the linear expansion coefficient, the length and the resistivity of the as-quenched sample, respec lively. The obtained results are discussed.
THE SCALING EXPONENTS OF MASS DISTRIBUTION IN INHOMOGENEOUS COMPOSITES WITH SELF- SIMILAR STRUCTURES
Authors: ZHANG MIN  , TAO RUI-BAO  , ZHOU SHI-XUN  ,   复旦大学物理系
Published: December 2020

The scaling low of mass distribution in composite media which have the same topology as that of the corresponding fractals but have more inhomogeneity in mass distributions is studied, and the scaling exponents (dimensions) are calculated. We suggest that a set of dimensions may be introduced to describe the details of the inhomogeneous distribution of mass.
WARM ION EFFECTS ON KINETIC DRIFT CYCLOTRON LOSS CONE INSTABILITIES
Authors: GUO SHI-CHONG  , SHEN JIE-WU  , CAI SHI-DONG  ,   (1)中国高等科学技术中心(世界实验室)理论物理分中心; (2)中国科学院物理研究所
Published: December 2020

The effects of adding warm plasmas on the kinetic DCLC mode in high βloss cone plasmas are investigated in detail. It is found that when the fluid DCLC mode is stabilized by a small amount of warm plasma, the kinetic excitation still remains due to two different mechanisms, namely, (1) magnetic drift resonance dissipation excites the negative energy wave; (2) a new type of positive energy wave can become unstable as the resonance condition is met. Comparing with fluid approximation theory, more warm plasmas are needed to suppress the kinetic DCLC instabilities.
THE GROWTH OF LARGE SINGLE CRYSTAL OF LnBa2Cu3O7-δ AND THEIR SUPERCONDUCTIVITY
Authors: SUN DUN-MING  , CHEN ZU-YAO  , QIAN YI-TAI  , ZHANG HAN  , NIU LI-WEN  , CHENG TING-ZHU  , ZHOU GUI-EN  , XIA JIAN-SHENG  , FANG MING-HU  , ZHANG QI-RUI  ,   (1)中国高等科学技术中心(世界实验室)理论物理分中心; (2)中国科学技术大学结构成分分析中心; (3)中国科学技术大学物理系; (4)中国科学技术大学应用化学系
Published: December 2020

The growth of large single crystal LnBa2Cu3O7-δ and their superconductivity is reported in this paper. Identification methods for single crystals e.g., Laue pattern, precession pattern and the OOL multiple-order diffraction with X-ray, are discussed.
EVEL STRUCTURES OF RYDBERG STATES OF Ru ATOM
Authors: TANG JIAN-ZHI  , XU XIANG-YUAN  , HUANC WEN  , ZHAO WEN-ZHENG  ,   清华大学现代应用物理系,北京,100084
Published: December 2020

The energy level structures of Rydberg slates of Ru atom in 4d7(4F) ns series and 4d7(4F) nd series are measured by means of laser resonance excitation-electric field ionization method. The relative line strengths within the multiplet of an electron configuration are calculated. The theoretical results are coincident with the experiments satisfactorily. The terms of the measured spectrum lines can be identified.
TIME RESOLVED STUDIES OF STATE TO STATE VIBRATIONAL ENERGY TRANSFER (Ⅰ)——SELF-COLLISION PROCESSES OF IDIONE MOLECULES
Authors: XIANG TIAN-XIANG  , SUN SHENG  , GONG SHUN-SHENG  , WANG JIA-MIN  ,   (1)南京大学化学系,南京,210008; (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
Published: December 2020

This paper presents an experimental procedure to study state-to-state collisional dynamics by using tunable and pulsed laser techniques and timeresolved and dispersed fluorescence method. The decay processes of electronically and vibrationally excited iodine, B3Πou+(v＇=19), to the adjacent vibrational states in self-collisional events have been directly observed in experiments. The rate constants for the state-to-state vibrational transfer obtained are, kv(19→18) = (2.21±0.33)×10-11cm3s-1mol-1 and kv(19→20) = (1.44±0.20)×10-11cm3s-1mol-1. These results are in satisfactory agreement with the principle of detailed balance. In addition, the collision-free lifetimes and the radiationless quenching rate constants in B(v＇= 19) were also obtained in the experiments.
ENHANCED SQUEEZING OF THE INTRACAVITY LIGHT FIELD PRODUCED IN PARAMETRIC AMPLIFICATION VIA LASER INJECTION
Authors: TAN WEI-HAN  , ZHANG WEI-PING  , TAN WEI-SI  ,   中国科学院上海光学精密机械研究所,上海,201800
Published: December 2020

For the squeezing of intracavity light fields produced in a parametric amplifier located within a cavity, we use laser injection which can compensate the effects of the cavity losses and therefore reduce the random force on the squeezing, and thus generate a large amount of intracavity squeezing near the threshold of oscillation.
WETTING TRANSITION IN A CLOSED SYSTEM
Authors: DING E-JIANG  ,   北京师范大学低能核物理研究所,北京,100875
Published: December 2020

The wetting transition in a closed system between two parallel walls with fixed temperature, volume and number of particles is discussed. It is shown that a closed system is different in wetting aspect from an open system. The conclusion in agreement wirh the investigation via Monte-Carlo techniques is obtained analytically.
GEOMETRICAL CONFIGURATIONS OF (Si)n/(Ge)n SUPERLATTICES
Authors: ZI JIAN  , ZHANG KAI-MING  ,   复旦大学物理系,上海,200433
Published: December 2020

The geometrical configurations of (100)-oriented (Si)n/(Ge)n (n = 1-6) strained superlat-tices on Si1-xGex(x = 0-1) substrates are calculated by using Keating model. The influence of substrate on the growth of the superlattices is discussed. The calculations indicate that proper choice of substrate Si1-xGex is beneficial to the growth of (Si)n/(Ge)n superlattices.
EVOLUTION FROM PERIODICITY TO NON-PERIODICITY OF THE ELECTRON PHASE ORBITS IN A FREE ELECTRON LASER WITH UNTAPERED WIGGLER
Authors: ZHANG SHI-CHANG  , HU ZHONG-XIU  , WANG WEN-YAO  ,   电子科技大学物理系,成都,610054
Published: December 2020

In this paper the motion of the electrons in a free-electron laser with untapered wiggler is discussed. We find the possibility of stochastic behavior for some traped electrons with the increase of the plasma frequency of the electron beam, when the energy exchange between the electron beam and the laser fields is taken into account.
THE INFLUENCE OF METAL OPTICAL PROPERTY ON THE POLARIZATION EFFECT IN MEASUREMENTS OF THIN WIRE DIAMETER WITH HIGH ACCURACY
Authors: XIE JIAN-PING  , QIU YAN-HUI  , MING HAI  , LI CHUAN-QI  , NIU YA-PING  , XI LI-FENG  , S. OZONO  ,   (1)日本东京大学精密机械工程系,日本,东京,113; (2)中国科学技术大学精密机械系,合肥,230026; (3)中国科学技术大学物理系,合肥,230026
Published: December 2020

The influence of metal optical property on the polarization effect in measurements of thin wire diameter with high accuracy has been studied in the present paper. The experimental Values of thin wire diameter obtained from its Fraunhofer diffraction patterns, which are produced by polarized light with the vibrations parallel and perpendicular to the wire axis respectively, is different. The theoretical analysis shows that this difference of wire diameter is approximately proportional to the imaginary part of complex index of metal, and is inde-pent of its real part. Some experimental results agree well with the theory.
THE DESCRIPTION OF GLOBALLY REGULAR SCHWARZS-CHILD SPACE-TIME IN A NEWMAN-PENROSE FORMALISM
Authors: QIANG WEN-CHAO  ,   西安冶金建筑学院基础课部,西安,710055
Published: December 2020

The desciption of globally regular SchwarzschiId space-time in a Newman-Penrose formalism is given in the Schwarzschild coordinate and the Kruskal coordinate respectively. It is shown that this space-time has the global algebraic property. Globally it is of Petrov type-D. The behaviours of tetrad components of the Weyl tensor, the spin coefficients and null vectors are also discussed.
OPTICAL SECOND HAMONIC NONLINEARITY IN QUASI PARABOLIC MULTIQUANTUM WELL STRUCTURE
Authors: ZHAN DA-SANPAN SHAO-HUA  , PAN SHAO-HUA  ,   中国科学院物理研究所,北京,100080
Published: December 2020

In this article, we consider the optical second harmonic nonlinearity (corresponding to x(2)) associated with intersubband transitions in a doped parabolic multiquantum well structure, due to the anharmonic correction. The calculation indicates that the x(2)(2ω) is larger than that of the bulk GaAs by 1 to 2 orders of magnitude, and the resonant transition frequencies are in the middle infrared region
A NUMERICAL STUDY OF RADIATIVE LOSSES IN ALUMINUM PLASMAS
Authors: LI YUE-LIN  , XU ZHI-ZHAN  , CHEN SHI-SHENG  ,   中国科学院上海光学精密机械研究所,上海,201800
Published: December 2020

A collisional-radiative numerical model is developed for studies of radiative losses and ion abundances in aluminum plasmas. Atomic processes such as collisional ionization and recombination, collisional excitation and dexcitation, radiation recombination, and spontaneous radiation are included. The dynamic results of ion abundances, radiation losses are discussed under the approximation of constant ion density and optically thin condition.
COADSORPTION OF SMALL MOLECULES ON Pd(100) SURFACE
Authors: ZHANG YAO-JU  , LU WEN-CHANG  , ZHANG TAO  ,   河南师范大学物理系,新乡,453002
Published: December 2020

The coadsorptive properties of some small molecules adsorbed on Pd(100) surface are investigated by taking the tight-binding model and the one electron approximation. The results show that (1) the indirect interaction between the two admolecules (or adatoms) on Pd (100) surface has an oscillatory behaviour with the decrease of the coupling strength between these adsorbates and the substrate, and (2) the existence of O2 or H2 affects the dissociation of NO on Pd(100). In addition, some adsorptive structures are derived from adsorbate-ad-sorbate indirect interactions. These results are compared with experimental results.
TWO-EXCITON SQUEEZED STATES AND ITS RECOMBINATION RADIATION IN SEMICONDUCTOR
Authors: HUANG HONG-BIN  ,   东南大学物理系,南京,210018
Published: December 2020

This paper introduces two-exciton squeezed states. For the two cases of "non-Bose" and Bose approximations of one-exciton, the squeezings and the second correlations of quantum and space correlated pairs of excitons, and the squeezings of its recombination radiations are discussed. It is shown that, in these two cases, the Bose approximations of the two-exciton correspond to the contractions of group SU(2) and group SU(1,1) to the group of harmonic oscillator, respectively. The influences of the contractions on the squeezings and correlations of the two-exciton are also given.
TWO-DIMENSIONAL OPTICAL GEOMETRIC MOMENT TRANSFORM
Authors: CHEN YAN-SONG  , ZHENG SHI-HAI  , LI DE-HUA  ,   中国科学院物理研究所,北京,100080
Published: December 2020

Extraction of invariant moments used for pattern recognition is a subject in optics to be further studied. In this paper, an optical method utilizing a single holographic mask is presented for realizing two-dimensional geometric moment transform. The invariant moments of a group of English letters are extracted successfully, which indeed exhibit the invariant features under translating and rotating
GENERATION OF PULSED SQUEEZED LIGHT FIELD VIA FORWARD FOUR-WAVE MIXING
Authors: HE LIN-SHENG  , JIANG HAI-HE  , XIA YU-XING  ,   中国科学院安徽光学精密机械研究所,合肥,230031
Published: December 2020

A scheme is proposed, in which the pulse train of squeezed light is generated via forward four-wave mixing through a nonlinear medium with third-order polarizability, coherently pumped by a train of pulses of modelocked laser. One of the quadrature noise compoments of the squeezed light is measured with a balanced homodyne detector using a pulse train as the local oscillation. The theoretical results show that the fairly high-intensity output of squeezed light can be achieved, and the noise-power spectrum of the light is almost completely squeezed and exhibits the form of a train of pulses, but the shape of squeezed spectrum is reversed with respect to that of the pulse train of the input light.
ELECTRON TRAJECTORIES AND STABILITY IN FEL WITH AN AXIAL GUIDE MAGNETIC FIELD
Authors: SHU XIAO-JIAN  ,   北京应用物理与计算数学研究所,北京,100088
Published: December 2020

The single-particle trajectories of relativistic electrons are studied in a magnetic field con-figuration consisting of a uniform axial guide field and a helical periodic wiggler field. The steady-state trajectories and the first order perturbed trajectories are analysed carefully. Based on the numerical simulations about the experiments which have been made at Shanghai Institute of Optics and Fine Mechanics, the effect of the betatron oscillations due to the transverse varing of wiggler field is first shown in the case that there is a axial guide field. In this case the betatron oscillations equations are drived. Its period and the relation between phase in X dirction and in Y dirction are obtioned. Further more, numerical simulations are made. The results of analytical calculation are in good agreement with the numerical simulations.
A THEORETICAL CALCULATION OF VALENCE-BAND OFFSETS AT HETEROJUNCTIONS
Authors: WANG REN-ZHI  , HUANG MEI-CHUN  ,   厦门大学物理系,厦门,361005
Published: December 2020

Basing on the density functional theory and LMTO-ASA band method, we study the properties of an average hybridization energy Ez of sp3 hydrid orbital, near the interface in semiconductor superlattice. It is shown that the Ez can be considered as a reference energy level for calculating the valence-band offsets △Ev at heterojunctions. The results indicate that the theo-retical values of the △Ev obtained with this method for several hererojunctions are in agreement with other theoretical and experimental results.
EFFECT OF ADDITION OF BORON ON SPUTTERING YIELD OF NICKEL
Authors: WANG ZHEN-XIA  , ZHANG JI-PING  , PAN JI-SHENG  , TAO ZHEN-LAN  , ZHANG HUI-MING  , ZHANG WEI-PING  , LU ZHAO-LUN  ,   (1)杭州大学测试中心,杭州,310028; (2)中国科学院上海原子核研究所,上海,201800
Published: December 2020

The effect of dopant boron in bulk nickel on sputtering yield has been investigated by the Rutherford backscattering spectroscopy technique. It was shown that a decrease in sputter-ing yield with respect to pure nickel target can be described qualitatively by Painter and Ave-rill's model, but the decrease in our experiment appeared larger than that estimated by P-A model. The obvious effect of textured surface upon the reduction of sputtering of B-doped Ni target has been shown. It is conjectured that this reduction of net sputtering yield is very probably the result of a surface topography-binding energy combined effect.
ANALYSES AND MEASUREMENTS OF THE PERFORMANCE PARAMETERS OF THE HEXAPOLE MAGNET STATE-SELECTING SYSTEM
Authors: MEI GANG-HUA  , ZHU XI-WEN  , HUANG GUI-LONG  ,   中国科学院武汉物理研究所,武汉,430071
Published: December 2020

Taking into account the location, size and also the shape of the defector, we calculated the values of the selectivity and the effective transmittance solid angle of the hexapole magnet system, and compared the results with those of the previous method. The dependence of the selectivity and the effective transmittance solid angle on various experimental parameters, and the ways to improve the performance of the hexapole magnet system were discussed. The selectivity was measured by laser-induced fluorescence (LIF) and the results were in good agreement with the theoretical ones.
AMPLITUDE SQUEEZING OF LIGHT FIELD IN CAVITY
Authors: LIU ZHENG-DONG  , CAO CHANG-QI  , D. L. LIN  ,   (1)北京大学物理系,北京,100871; (2)江西师范大学物理系,南昌,330027; (3)美国纽约州立大学布法罗分校
Published: December 2020

In case the speed v of the atoms flying scross the cavity can be exactly adjusted, the light field originally in the cavity may be built into amplitude-squeezed state by adjusting the speed v to the preassigned value. It is also capable to make the photon distribution to have several peaks.
RELATION BETWEEN THE ANDERSON TRANSITION ZONE AND ENERGY OF THE AUBRY MODEL
Authors: SUN JIN-ZUO  , WANG CHUAN-KUI  , WANG JI-SUO  ,   山东聊城师范学院物理系,聊城,252000
Published: December 2020

On the basis of having proved that there exists the Anderson transition zone in the Aubry model of one-dimensional incommensurate systeme, we further study the relation between the Anderson transition zone and energy. Our numerical results indicate that the Anderson transition zone of the eigenstates in higher energy region is located in the range of lower values of the potential strength V, while, the Anderson transition zone of the eigenstates in lower energy region is located in the range of higher values of V.
MECHANISM FOR THE DELAY OF DESTRUCTIVE BREAKDOWN IN TCE OXIDE FILMS
Authors: LI GUAN-QI  , HUANG MEI-QIAN  , LIU BAI-YONG  , Y. C. CHENG  ,   (1)华南理工大学应用物理系,广州,510641; (2)香港大学
Published: December 2020

This paper study the delay of destructive breakdown and its mechanism on SiO2 films by TCE treatment. The result show that the breakdown current capacity increase with increasing the TCE flow-rate, treatment time and temperature, and reducing the oxygen partial pressure. However, excessive quantity of the TCE flow-rate and prolonging of treatment time make the breakdown characteristics degradation begin to appear. The results also indicate, the increment of breakdown current capacity is associate with the increment of density of electron trap in SiO2 films. In this paper, we propose a breakdown model of "low barrier point-electrical field enhanced" which involve three processes of mutual reinforcement, and consider for the first time the effect of H2O in TCE oxidation on the breakdown characteristics. The restrained function of electron trap on electrical field enhanced in low barrier point is quoted, and analyze the mechanism for delay of destructive breakdown in TCE oxides.
POSITRON ANNIHILATION STUDY ON DEFORMATION OF HIGH PURITY IRON UNDER DIFFERENT STRAIN RATE
Authors: WU YI-CHU  , TIAN ZHONG-ZHUO  , CHANG XIANG-RONG  , XIAO JI-MEI  ,   北京科技大学材料物理系,北京,100083
Published: December 2020

Variation of S-parameter with the strain (S-ε curve) under different strain rate are investigated by combining Doppler broadening measurement with slow tensile test. Experimental results are as follows:1. Under slow strain rate, the S-ε curve in high purity iron does not tend to saturation. The slower the strain rate is, the more evident the "non-saturation phenomenon".2. Variations of S-ε curve with strain rate are attributed to the different configuration of dislocation distribution under different strain rates.3. As high purity iron is deformed, the increment of S-parameter depends not only on dislocation density but also on vacancy concentration, and we attibute the so called "non-saturation phenomenon" of S-ε curve to the strain induced vacancies.
POSITRON ANNIHILATION STUDY ON THE INTERACTION BETWEEN HYDROGEN ATOMS AND DEFECTS IN COLD-ROLLED NICKEL
Authors: WU YI-CHU  , TIAN ZHONG-ZHUO  , CHANG XIANG-RONG  , XIAO JI-MEI  ,   北京科技大学材料物理系,北京,100083
Published: December 2020

The interaction between hydrogen atoms with defects in coldrolled nickel is investigated by Doppler broadening measurement. Experimental results show that the S-parameter in cold-rolled-hydrogen-charged nickel increases as compared with that of hydrogen-free cold-rolled nickel. And the increament of S-parameter depends on vacancy concentration, being almost independent of dislocation density. It is suggested that hydrogen atoms can act as centers of vacancy agglomeration, leading to the formation of vacancy cluster.
CORONA CHARGING AT ELEVATED TEMPERATURE AND CHARGE TRANSPORT FOR MYLAR PETP FOILS
Authors: XIA ZHONG-FU  , WANG YU-DE  , DING HAI  , YANG GOO-MAO  , SHT DONG-BING  , SUN XI-MIN  ,   同济大学物理系,上海,200092
Published: December 2020

In this paper, charge storage stability of constant voltage corona charged Mylar PETP at room and elevated temperature is discussed. Significant difference between influence of dipole peak at low temperature for Mylar PETP and that of real charge peak at lower temperature for nonpolarity fluoropolymers on charge stability is analyzed. The influence of bulk conduetivity of Mylar PETP charged at RT and elevated temperature on mean charge depth and the charge transport model in the bulk during TSI) after charging at RT for Mylar PETP are studied by means of conductivity glow curve measurement and heat pulse technique.
XPS STUDIES OF Ti/BiSMUTH-BASED SUPERCONDUCTOR INTERFACE REACTIONS
Authors: MENG GE  , SHEN DIAN-HONG  , LI NAN  , XIE KAN  , LIN ZHANG-DA  , WANG YU-HE  , LI LIN  ,   中国科学院物理研究所,北京,100080
Published: December 2020

X-ray photoelectron spectroscopy has been used to investigate the interactions between Ti and bismuth-based superconductors. It is shown that Ti adatoms leach oxygen from the under-lyng superconductors, forming Ti-O bond on the surface. In the interface region, Cu-O and Bi-O bonds are destroyed, Cu2+ and Bi3+ are reduced to metallic atoms. The electronic structures of the superconductors are disrupted by the Ti adatoms. By using the standard four-probe method, it is found that after Ti deposition, the transition temperature of the thin film is 10K lower and the zero resistance can not be reached.
INFLUENCE OF SURFACE TOPOGRAPHY ON THE SPUTTE RING YIELDS OF SILVER
Authors: PAN JI-SHENG  , WANG ZHEN-XIA  , TAO ZHEN-LAN  , ZHANG JI-PING  , ZHANG HUI-MING  , ZHAO LIE  ,   (1)杭州大学中心实验室,杭州,310028; (2)中国科学院上海原子核研究所,上海,201800
Published: December 2020

The angular distributions and yields of silver atoms sputtered from a Ag sample have been measured using collector technique and RBS analysis. The Ag target was sputtered at normal incidence with 27keV Ar+ ions. The irradiated surface was examined by scanning electron microscopy. It was found that all the angular distributions were over-cosine with different irradiation dose, but the sputtering yields were dose-dependent. The experimental result can be explained with surface topography and sputtering yield as a fuction of the angle of incidence. It is found that surface topography seems to be an important factor to influence sputtering yield. a new concept, namely "apparent yield", is presented.
ELECTRONIC STRUCTURE OF THE ONE-DIMENSIONAL NANOMETER SOLID STATE MODEL
Authors: XU HUI  , WEN SHENG  ,   中南工业大学应用物理系,长沙410083
Published: December 2020

The electronic structure of the one-dimensonal nanometer solid state model is discussed in terms of the grain size and the disordered degree of the grain surface by the computation of the density of electronic states. The result shows that the effect of the grained size on the electronic structure is great, and the disordered degree of the trained surface cause mainly the change of the energy width and the magnitude of the density of state.
INVESTIGATION OF THERMAL CONDUCTANCE ON BOLOMETRIC INFRARED DETECTOR OF HI GH Tc SUPERCONDUCTING FILM GROWN ON MULTILAYER SUBSTRATE
Authors: WANG DE-NING  , CHEN HONG  , WANG WEI-YUAN  ,   中国科学院上海冶金研究所,上海200050
Published: December 2020

In this paper, we set up the model of Gaussian distribution on the temperature of illuminated superconducting film and derive a serial formula, from which the equation of the substrate thermal conductance G3= 2πks· d · y(a(t),b(t),r) can be obtained. It can be used not only for G of single-layer substrate, but also for G of multi-layer substrate. The calculated results are in good agreement with the experimental ones.Using Maths CAD programm, the relations between illumination radius r, substrate thickness d or frequency f and G3 could be obtained. Based on the above, the optimized structure or art parameters of the detector can be selected and some effective methods for improving its properties will be considered.
APPLICATION OF GENERALIZED MOBIUS INVERSE FOR- MULA ON PAIRWISE INTERACTION IN 3D LATTICE
Authors: Guo Quan-lin  ,   北京应用物理与计算数学研究所,北京100088
Published: December 2020

Chen Mobius inverse formula is further generalized. This generalized formula is applied to solve the inverse problem of pairwise interaction in 3D lattice. After discussing structural characters of several typical perfect crystals, we give an algorithm based upon iterative methed with numerical examples. Stability and error of this algorithm are analyzed.
ON THE ORDER OF THE ORTHORHOMBIC-TETRAGONAL PHASE TRANSITION IN YBa2Cu3O7-δ
Authors: XIE XIAO-MING  , CHEN TING-GUO  ,   中国科学院上海冶金研究所,上海200050
Published: December 2020

Two low frequency internal friction peaks, one induced by oxygen jumping in the Cu(l)-O basal planes in the orthorhombic phase and the orther in the tetragonal phase, were systematically studied. The order of orthorhombic-tetragonal phase transition was analysed based upon the internal friction data. It was inferred that the transition, generally considered as second order, may actually be first order, at least near 200℃.
HETEROEPITAXIAL GROWTH OF ZnSe ON GaAs(lOO) SUBSTRATE BY HOT WALL BEAM EPITAXY
Authors: WANG JIE  , Lü HONG-QIANG  , LIU YONG  , WANG XUN  , YAO WEN-HUA  , SHEN XIAO-LIANG  ,   (1)复旦大学分析测试中心,上海200433; (2)复旦大学物理系,上海200433
Published: December 2020

ZnSe (100) single crystal films are grown by hot wall beam epitaxy on GaAs (100) substrate. The quality of films are examined by LEED and AES in situ. The films show sharp C(2×2) LEED pattern. When sample are prepared with high growth rate, the Raman spectra show that there are TO modes which are usually forbidden in ZnSe (100) films. ZnSe(100) films with twin can be explained by the TO modes in the Raman spectra. This interpretation is supported by the result of XRD.
EFFECTS OF HUBBARD INTERACTION AND SITE-TYPE IMPURITY POTENTIAL ON ELECTRONIC STATES IN TRANS-POLYACETYLENE
Authors: JIA RONG-YI  , YAN LI-GEN  ,   北京师范大学物理系,北京100875
Published: December 2020

In this paper, the SSH mode] has been extended to include the site-type impurity potential and the Hubbard interaction. The energy spectra and the electronic states of soliton in transpolyacetylene have been studied by the self-consistent iterative approach. Our numerical calculations have shown that the important differences in the effects of impurity potential and Hubbard interaction on electronic states of soliton. Namely, the site-type impurity potential is to shift the midgap states of the charged solitons in the opposite direction with Hubbafd interaction. Our conclusion are coincident with experimental results
CRITICAL CURRENT DENSITY IN NEUTRON IRRADIATED BULK YBa2Cu3Oy
Authors: WEI CHONG-DE  , LIU ZUN-XIAO  , GAN ZI-ZHAO  , REN HONG-TAO  , XIAO LING  , HE QING  ,   (1)北京大学物理系,北京100871; (2)北京有色金属研究总院,北京100088
Published: December 2020

The magnetization curves of neutron irradiated bulk YBa2Cu3Oy prepared by melt-textured growth method were measured from 1.5 to 85 K. Flux jumps were observed for H∥c at 6K. The anisotropies of critical current are analysed in detail- The pinning mechanism and physical model for flux jumps are discussed.
PHASE DIAGRAM OF ANTIFERROMAGNETIC SPIN GLASS WITH INFINITE-RANGED EXCHANGE INTERACTION
Authors: SHEN YU  , SHEN ZHONG-JUN  , YU LU  ,   (1)华东师范大学物理系,上海200062; (2)中国科学院理论物理研究所,北京100080
Published: December 2020

In this paper, we establish a Ising model of antiferromagnetic spin glass and give its phase diagram.
ORDERED APERTURE ANGLE OF POWER SPECTRA OF RANDOM ARRAY
Authors: ZHONG XI-HUA  , ZHU YA-FEN  ,   北京大学物理系,北京100871
Published: December 2020

The ratio of the power spectra of random array to whose unit is called the coherent factor. By analyzing the statistical data experiment of ours, we have studied the fine structures of the curves of coherent factor, introduced a new concept, namely the limited random walk; and found out the formula of the ordered aperture angle for which the values of coherent factor take from N2 to N. This formula has shown that the angle is inversely propertional to the dimension of random array, but is indeperdent of the total number of random points, and that the angle is several times as large as that of the power spectra of regular array in the same domain.
GAUSSIAN-TO-UNIFORM BEAM CONVERSION WITH PHASE-ONLY MASKS MADE BY REACTIVE ION-ETCHING
Authors: ZHANG JING-JUAN  , YANG GUO-GUANG  , XU CHAO  , LIAN DE-LIANG  , CHEN JUN-BEN  , HUO YU PING  , GAO SHI-PING  , CHEN BAO-QIN  ,   (1)中国科学院等离子体研究所,合肥230031; (2)中国科学院微电子研究中心,北京100010; (3)中国科学院研究生院,北京100039
Published: December 2020

The general optical transformation theory is used for the design for converting Gaussian laser beam into a uniform profile. The transformation system can be achieved with two phase-only masks system. The phase-only mask may be fabricated with reactive ion-etching on a quartz plate. Experimenra) results indicate that the output beam profile is consistent with the theoretical calculation. The conversion efficiency is higher than 95%.
HIGH-LIGHT-INTENSITY SPECTRICAL LAMP PUMPED 87Rb MASER
Authors: DENG JIN-QUAN  , AN SHAO-FENG  , LIU JIN-TING  , TAN YONG-FANG  ,   中国科学院武汉物理研究所波谱与原子分子物理国家重点实验室,武汉430071
Published: December 2020

This paper describes, two kinds of high-light-intensity bulb, one is a mushroom-shaped bulb and the other is a round flat bulb, replacing the usual spherical bulb tor optical pumping. We light these two bulbs with a high r. f. source and carry out the experiments of pumping 87Rb maser with these lamps. The light intensities of the two bulbs are respectixely 2. 3 and 2 times as that of the spherical bulb. And the largest output powers of the maser pamped with these two lamps are-60 and -62 dBm at the optimum resonance cell temperature of 67 and 66℃ respectively. The improvement of short-term frequeney stability of the round flat bulb pumped 87Rb maser is consistent with the increment of the output power of the maser.