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Chin. Phys. B  
  Chin. Phys. B--1996, Vol.5, No.7
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CLASSICAL AREAS OF PHENOMENOLOGY

INFLUENCE OF DRIVING-FIELD PHASE FLUCTUATION ON ABSORPTION AND DISPERSION IN A SIMPLE THREE-LEVEL ATOMIC SYSTEM

GONG SHANG-QING, XU ZHI-ZHAN, TENG HUA-GUO
Acta Phys. Sin. (Overseas Edition), 1996, 5 (7): 505-510 doi: 10.1088/1004-423X/5/7/004
Full Text: [PDF 164 KB] (Downloads:322)
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The steady-state behavior of a simple three-level atomic system has been investi-gated by taking into account the effect of phase fluctuations in the driving field. For a monochromatic driving field, lasing with or without inversion can be established over a wide frequency range for the probe and driving fields. A large refractive index can also be generated even if the population inversion is positive. For a finite linewidth of the driving field, the refractive index enhancement tends to decrease. Furthermore, a behavior change from inversion laser to noninversion laser can occur as the driving field linewidth increases.

THEORETICAL STUDIES ON LASER-INDUCED GRATINGS IN ORGANIC PHOTOISOMERS

SI JIN-HAI, ZHAO JIANG, WANG YOU-GUI, YE PEI-XIAN
Acta Phys. Sin. (Overseas Edition), 1996, 5 (7): 511-519 doi: 10.1088/1004-423X/5/7/005
Full Text: [PDF 301 KB] (Downloads:271)
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A theoretical model for formation of light-induced gratings in organic photoisomers is presented. Using this model, dynamic behaviors of the light-induced gratings are studied theoretically for two different cases: in the first case, in addition to a CW loser generating the writing beams and the reading beam, a pulsed laser is used as an optical pump, in the second case, the writing beams are provided by a pulsed laser, and the reading beam comes from a CW laser. Agreement between experiment and theory is also demonstrated.
ATOMIC AND MOLECULAR PHYSICS

A NEW EXPERIMENTAL METHOD IN THE STUDY OF IONIC RYDBERG STATES BY RESONANCE IONIZATION MASS SPECTROSCOPY

HUANG WEN, XU XIANG-YUAN
Acta Phys. Sin. (Overseas Edition), 1996, 5 (7): 493-498 doi: 10.1088/1004-423X/5/7/002
Full Text: [PDF 169 KB] (Downloads:254)
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We report a new method for detecting highly excited ions. With a strong constant electric field ionization following the extracting of ions by a pulsed electric field in a time-of-flight mass spectrometer, the direct multi-photon ionization background can be eliminated in laser multi-step resonance ionization mass spectroscopy of ionic Rydberg states. A high detection efficiency call be obtained for law members of ionic Rydberg states by use of this method. We have applied the method in the study of the spectroscopy of ionic Rydberg states ia ytterbium.

K-SHELL IONIZATION OF IRON BY ELECTRON BOMBARDMENT

HE FU-QING, LONG XIAN-GUAN, PENG XIU-FENG, LUO ZHENG-MING, AN ZHU
Acta Phys. Sin. (Overseas Edition), 1996, 5 (7): 499-504 doi: 10.1088/1004-423X/5/7/003
Full Text: [PDF 156 KB] (Downloads:469)
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K-shell ionization cross sections for Fe by electron impact were measured by detecting the characteristic X-rays emitted from the thin solid film target of known mass thickness with a Si(Li) detector. Reflection correction of the substrate was done using a bipartition model of electron transport. The experimental results are satisfactory as compared with the theoretical calculation and empirical formula.
THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

THE TWO-BOSON SCATTERING PHASE SHIFTS IN THE GENERAL φ6 THEORY WITH THE GAUSSIAN WAVE-FUNCTIONAL APPROACH

LU WEN-FA, XU BO-WEI, ZHANG YU-MEI
Acta Phys. Sin. (Overseas Edition), 1996, 5 (7): 481-492 doi: 10.1088/1004-423X/5/7/001
Full Text: [PDF 272 KB] (Downloads:259)
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The two-particle scattering phase shifts with a λφ4 +ξφ6 interaction are com-puted in (1 + 1) and (2 + 1) dimensions using the Gaussian wave-functional approach.Through numerical analysis, we give the phase-shift curves with respect to the scat-tering energy for most cases of this theory. In (1 + 1) and (2 + 1 ) dimensions, for the symmetry vacuum the phase shifts are positive or negative depending on the signs of the renormalized parameter, while for the asymmetric vacuum the phase shifts are negative.
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES

THEORETICAL INVESTIGATION OF ELECTRON-NEUTRAL ATOM COLLISION PROCESS AND ELECTRON TRANSPORT PARAMETERS IN DC GLOW DISCHARGE OF PLASMA WITH A TRANSVERSE MAGNETIC FIELD

WEI HE-LIN, LIU ZU-LI, LI ZAI-GUANG, ZHENG QI-GUANG
Acta Phys. Sin. (Overseas Edition), 1996, 5 (7): 520-529 doi: 10.1088/1004-423X/5/7/006
Full Text: [PDF 264 KB] (Downloads:367)
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A Monte Carlo simulation (MCS) technique is used to simulate the cathode sheath region of a helium dc glow discharge. In such a simulation, a nonuniform electric field and a transverse uniform magnetic field are considered. When the magnetic field intensity increases from 0 to 800 G, all types of collision considered in this paper are enhanced. This result is in agreement with the experimental result. The results also show that with the increase of magnetic field intensity, the electron transport time, the electron density increase, and the electron mean energy decreases.
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES

MICROSTRUCTURE AND FRACTAL FORMATION OF ANNEALED Ge-Au FILM AND Ge-Au/Au BILAYER FILMS

BA LONG, ZENG JIAN-LIN, ZHANG SHU-YUAN, WU ZI-QIN
Acta Phys. Sin. (Overseas Edition), 1996, 5 (7): 530-537 doi: 10.1088/1004-423X/5/7/007
Full Text: [PDF 393 KB] (Downloads:228)
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The as-deposited and annealed Ge-Au film and Ge-Au/Au bilayer films have been observed by transmission electron microscopy. The bilayer with a composition of Ge-5at%Au film is amorphous, while the Ge-22at%Au film is polycrystalline. Higher concentration of Au raises the structural heterogeneity and instability. Fractals can be observed in the Ge-5at%Au/Au bilayer samples annealed at 60-100℃. The difference of the fractal patterns generated from Ge-Au/An and a-Ge/Au films call be attributed to the higher heterogeneity and instability in Ge-Au/An bilayers.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

ELECTRICAL TRANSPORT BEHAVIOR OF AN Au DIFFUSE FRINGE FILM PERCOLATION SYSTEM

FENG CHUN-MU, GE HONG-LIANG, YU GAO-XIANG, ZHANG QI-RUI
Acta Phys. Sin. (Overseas Edition), 1996, 5 (7): 538-543 doi: 10.1088/1004-423X/5/7/008
Full Text: [PDF 188 KB] (Downloads:253)
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The preparation of a metallic diffuse fringe film system by dc-magnetron sputtering is described. The diffuse fringe structure of the film system is clearly observed in the SEM photograph when, during the film deposition process, the distance between the slit shutter and the substrate is large enough. Our experimental results show that the anomalous nonlinear I-V behavior of the system is mainly caused by the diffuse fringe effect. The temperature dependence of the sheet resistance is similar to that of the metallic flat film system in the temperature interval 77-300 K.

FORMATION AND MAGNETIC PROPERTIES OF A NOVEL Gd3(Fe,Ti)29Ny NITRIDE

B. NASUNJILEGAL, YANG FU-MING, ZHU JIAN-JUN, PAN HUA-YONG, WANG JIAN-LI, QIN WEI-DONG, TANG NING, HU BO-PING, WANG YI-ZHONG, LI HONG-SHUO, J. M. CADOGAN
Acta Phys. Sin. (Overseas Edition), 1996, 5 (7): 544-551 doi: 10.1088/1004-423X/5/7/009
Full Text: [PDF 217 KB] (Downloads:369)
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The novel Gd3(Fe0.978Ti0.022)29 compounds and their nitride have been synthesized. The X-ray diffraction patterns of the Gd3(Fe,Ti)29Ny and its parent compounds were indexed in the Nd3(Fe,Ti)29-type structure with a monoclinic symmetry and space group P21/c, Both the nitride and the parent compounds exhibit ferrimagnetlc coupling. Nitrogenatio led to an increase in Curie temperature and saturation magnetization. The Curie temperatures are 517K for the parent and 765K for the nitride. The saturation magnetizations σs at 4.2K are 101.9A·m2/kg for the parent and 128A·m2/kg for the nitride. Both the nitride and parent exhibit a planar anisotropy. Nitrogenation led to a decrease of the contribution of Fe-sublattice to planar anisotropy. The anisotropy fields at 4.2K are 9.8T for the parent and 6.5 T for the nitride.
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