Vol. 40, No. 12 (1991)
ATOMIC AND MOLECULAR PHYSICS
1991, 40 (12): 1897-1903. doi: 10.7498/aps.40.1897
All the perturbed Rydberg series, i. e., 3sns 1S0,3snp 1P1O, 3P0,1,2O,3snd 1D2 and 3snf 3F2,3,4O, have been studied by the multichannel quantum defect theory (MQDT). The analysis show that, the first two series are weakly disturbed, the rest, however, are strongly perturbed by the core-excited states: 3p4s 1P1O,3p2 1D2 and 3p3d 3F2,3,4O, respectively and 3snf 1F3O by 3p3d 1F3O which may be located 5613 cm-1 above the first ionizing potential according to our estimation. This prediction agrees with those made by other authors.
1991, 40 (12): 1904-1908. doi: 10.7498/aps.40.1904
Xα-SW SCF calculations have been carried out for hep structure cluster Al12M, where M is one of 3d transition metal impurity atoms Cr, Mn, Fe, Co and Ni. The calculated results indicate that the electronic structures near the Fermi levels are notably influenced by the impuriy atoms. With the variation of impurity atomic numbers the ionization potentials of the systems vary not monotonously.
1991, 40 (12): 1909-1914. doi: 10.7498/aps.40.1909
On the basis of impulse approximate merhod, a kind of analytical wavefunctions based on a potential model was used to calculate the l mixing cross section of thermal collision of Ryd-berg states of atomic Rb with rare gas (He, Ne). The results were compared with the experimental results and other theoretical values. These results show that there exists a kind of scaling law for the l mixing cross section of Rydberg alkali atoms.
The influence of chloride ions on SERS of PABA (p-aminobenzioc acid) and pyridine in Ag sol were discussed. SERS of PABA in Ag sol, the influence of chloride ions on and the time dependence of SERS intensities were obser ved. It was found that the decrease of SERS intensity was caused by that the solid like phase adsorption of PABA was destroyed and the molecular adsorption state was changed dut to the competitive adsorption of chloride ions. Besides, the influence of chloride ions on the time dependence of SERS intensities of a mixture of PABA/Ag sol and pyridine/Ag sol and on the light absorption of PABA and pyridine in Ag sol were studied. These experimtnts show that the influence of chloride ions on SERS in our system are mainly chemical.
AMPLITUDES OF ELECTRONIC WAVEFUNCTIONS AT NUCLEI FOR ATOMS (I)——HIGH ENERGY PHOTOIONIZATION PROCESSES OF ATOMIC IONS
1991, 40 (12): 1922-1928. doi: 10.7498/aps.40.1922
Based on the atomic self-consistent-field theory, we have performed relativistic calculations for reduced normalization factors and photoionization cross sections of occupied shells of various ionized iron and uranium atoms. For photoionization cross sections of a specific subshell of an atom with various degrees ionization, their ratios at photon energies above about 101keV agree with the squares of the ratios of the corresponding reduced normalization factors within 1%.
AMPLITUDES OF ELECTRONIC WAVEFUNCTIONS AT NUCLEI FOR ATOMS (II)——AMPLITUDES OF ELECTRONIC WAVEFUNCTIONS AT NUCLEI FOR ATOMIC IONS
1991, 40 (12): 1929-1933. doi: 10.7498/aps.40.1929
Based on the atomic self-consistent-field theory, we have performed relativistic calculations for reduced normalization factors of occupied shell wavef unctions of all atomic ions up to Z = 95. Their dependance on the atomic number and the degree of ionization are elucidated.
CLASSICAL AREA OF PHENOMENOLOGY
1991, 40 (12): 1934-1941. doi: 10.7498/aps.40.1934
In this paper, three modes of self-similar time informations on Cantor's fractal axis are constructed. Based upon a theoretical view point of generative production, we have found the recurrence formulae of spectral structure factor and shape factor of them, and plotted four series of spectral curves. By the comparison and progression of spectral curves, it can be seen that the structure factors play the ground role and the shape factors play the modulatory role, and there are competitive phenomena between generations. This investigation provides a basis for further understandng of the characteristics of self-similar informations by a new representation such as frequency domain.
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES
1991, 40 (12): 1942-1947. doi: 10.7498/aps.40.1942
A Monte-Carlo method is used to simulate the turbulent electrostatic field with space correlation. Evolution processes of relative and absolute diffusions of charged particles in this turbulent field can be obtained by integrating equations of motion of the particles. Simulation results agree well with the analytic theories both qualitatively and semi-quantitatively.
1991, 40 (12): 1948-1954. doi: 10.7498/aps.40.1948
The nonlinear drift-wave equation driven by a sinusoidal wave is discussed in a coordinate system moving in the driving phase speed. It is shown that the hysteretic jump of the wave energy and its transition to periodic motions from the steady state can be described integrately by the perturbation method proposed in this paper. The saddle-node and Hopf bifurcations of certain resonance mode are responsible for them respectively. The frequency of the periodic oscillatory wave energy is relevant to the eigen-frequency of the system, which is different from the one in the laboratory frame due to the Doppler shift and the nonlinea-rity.
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES
1991, 40 (12): 1955-1959. doi: 10.7498/aps.40.1955
Analysis of X-ray scattering and diffraction profile for the uniaxial tensile specimens of polyethylene films at different deformation stages have been performed at room temperature. The results show that within elastic region before yielding and post-yield region, the micros-train (distortion) increases notably and the micrograin size does not change much, but within constant stress region of plastic flow, micrograin size decreases rapidly and microstrain changes only a little.
EFFECTS OF STRUCTURE IN RUBIDIUM ACID PHTHALATE (RAP) ON ITS SINGLE CRYSTAL GROWTH HABIT AND DEFECT FORMATION
1991, 40 (12): 1960-1965. doi: 10.7498/aps.40.1960
Large perfect crystals have been grown by using (001) seed plates from aqueous solution. It is shown that the great difference in the growth rates along positive and negative a-axis directions and the defect formation are closely related to the orientation of the key groups of carboxyl radicals(I) and the open structure (mainly the structural channels A and B), respectively. A proposal for improving the quality of crystals by changing the orientation of the polar axis a is given.
1991, 40 (12): 1966-1972. doi: 10.7498/aps.40.1966
Using ultrasonic phase comparison method, the elastic properties and pressure derivatives of paramagnetic and antiferromagnetic phase of cobalt oxide are measured. The characteristic of interatomic forces in these two phases, the nature of bulk modulus and compressibility at Néel temperature, and the order of phase transition of cobalt oxide are discussed based on the experimental results.
1991, 40 (12): 1973-1979. doi: 10.7498/aps.40.1973
A series of a-Si:H/a-SiNx:H(x=0.5) multilayers are studied by positron annihilation technique (PAT). It is found that a large number of defects are induced in the interface region of a-Si:H/a-SiNx:H multilayers, owing to the structure mismatch of a-Si:H and a-SiNx:H. In the a-Si:H sublayer, there is a strained layer close to the interface, its thickness is about 8?, and a transition layer above the strained layer, its thickness is about 50?. There are a large number of defects in the transition layer, they are called the "interface defects".
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
1991, 40 (12): 1980-1985. doi: 10.7498/aps.40.1980
Photo-induced absorption in poly (bis (p-toluene sulphonate) ester of 2,4-hexadiyne-1, 6-diol) (PDA-TS) single crystal is studied theoretically. A mechanism of photo-induced absor-ption is proposed as exciton excitation. The binding energies for single and triple excitons are calculated and the photo-induced absorption peak at 1.35eV is considered as resulting from the transition 3Ag→3Bu. This agrees with experimental data.
1991, 40 (12): 1986-1991. doi: 10.7498/aps.40.1986
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.
1991, 40 (12): 1992-1998. doi: 10.7498/aps.40.1992
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.
1991, 40 (12): 1999-2005. doi: 10.7498/aps.40.1999
We have analysed the circularly symmetric sine-Gordon equation with bias and dissipation by means of a simplified perturbation theory. Analytic solutions that describe the dynamical behaviour of a quasisoliton trapped within the annular junction have been obtained. Between the results of our theory and numerical simulation, there exists a good agreement for the first zero field step (ZFS) in the l-V characteristic. A brief discussion of our results is also presented.
1991, 40 (12): 2006-2011. doi: 10.7498/aps.40.2006
Magnetic properties of the amorphous Co70Cr20Zr10 alloys near the Curie temperature are reported. The behavior is found to obey second-order phase transition laws with critical indices: β=0.45 ± 0.02, γ= 1.9 ±0.1, δ = 5.13±0.05, and the ferromagnetic Curie temperature Tc= (186.7±0.2)K. The critical indices satisfy the scaling law relationship γ = β(δ- 1), but their values deviated with the 3D-Heisenberg model. This behavior may arise from the magnetically inhomogeneous behavior of the alloy. Finally, the temperature dependence of the Kouvel-Fisher exponent γ(T) is discussed.
1991, 40 (12): 2012-2017. doi: 10.7498/aps.40.2012
The erasing process of stripe domains in (111)-oriented garnet bubble films was investigated experimentally in the presence of both an in-plane field Hin and a static bias field Hb. As Hb was kept constant and Hin was raised, the stripe domain erasing field Hs* and the bubble domain erasing field Hk* were measured as functions of the azimuthal angle β of the in-plane field. Taking the cubic magnetocrystalline anisotropy into account, we established a theory of stability of stripe domains subjected to both an inplane field and a static bias filed. The main features of the experimental results can be explained qualitatively by this theory. The angle at which both white and black domains are erased at the same time was obtained as βn=1/3(2nπ±arc cos│3/(21/2)(MsHb)/K1│)(n=0,±1,±2,…) which is in reasonable agreement with the experiments.
1991, 40 (12): 2018-2023. doi: 10.7498/aps.40.2018
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.
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY
1991, 40 (12): 2024-2031. doi: 10.7498/aps.40.2024
The reaction kinetic processes of species produced in a pulsed TEA CO2 laser induced si-lane plasma were studied with the time-resolved OES. It is showed that the time position of main peaks for different fragments' charactristic lines are appreciably different. The reaction kinetic processes are discussed based on the results. By comparing the time evolution of the lines of the fragments and considering the other results of OES, We infer that the final reaction channel of the laser-induced silane plasma is a Si producing channel.
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS
1991, 40 (12): 2032-2036. doi: 10.7498/aps.40.2032
The null geodesies and the stability of the nonsingular black hole are further investigated. The results show that null geodesies in the nonsingular Schwarzschild black hole are also complete as the timelike geodesies and a stable nonsingular black hole can exist.