The qualitative features of the four intrashell P states of the boron atom, i.e., the 2P01 (ground state), 2P02,2Pe1 and 4Pe1 states, are investigated. The interelectronic correlation is found to be strongly spindependent. The preferrence of orientation (redative to the total angular momentum) is found to be explicit. The geometric structures of relevant states and the modes of internal motion hav...
The experimental study of the relations between |ml| and field ionization thresholds of Stark components in Rydberg states of atomic cesium is reported. The three expressions of ionization thresholds of |ml|=0,1,2 in atomic cesium are obtained completely from the same experiment.
A brief of the parameterized inverse scattering methods including WKB and quantum-approaches are described at first and then,these methods are tested in detail by an example of model potential.
In low projectile energy region, the alignment of L3 vacancy state in Au and the projectile energy dependence of alignment were measured for several kinds of ions and Au collision systems by a simple method. Using the plane-wave Born approximation (PWBA) and taking into account the coulomb deflection effect, the alignment was calculated. It is shown that the present calculated results are closer t...
The real-time optical correlation-storage in photorefractive crystals has firstly been realized. It possesses the advantages of both storage and correlator, as well as the real-time character of photorefractive devices. It can performa real-time and fast selection of imformation correlated to the input ones from a great amount of stored imformation. The correlation degree of every information with...
The evolution law of the field entropy in the J-C model without rotating-wav approximation are invesitigated. Comparing with the results obtained with the rotating-wave approximation, the influence of the virtual photon processes on the evolution of the field entropy are discussed.
In this paper, we study the properties of two kinds of SU(1,1) coherent states of light with Bargman index k=1/4 and k=3/4 and show that they posses different quantum statistical properties. The atomic dynamical behavior in a two-photon Jaynes-Cummings model with initial SU(1,1)coherent state field are discussed. We show that the time evolution of atomic inversion displays peculiar periodic oscill...
Theoretical and experimental study has been made for the process of hard-des-truction produced by a laser acting upon the surface of charge-coupled devices (CCD) having the MOS structere. It is suggested that the thermal action of laser and the mechanical action of laser plasma shock wave are the main causes for destruction of the structure of the CCD. Optical breakdown threshold, visible damage t...
Based on the small-amplitude approximation on a CW pedestal, the role of self-steepening effect in nonlinear dynamics and transmmision of soliton in normal and anomalous dispersion regions is investigated. The results show that, by taking into account the loss and gain, as well as the self-induced Raman effect, there exist both bright and dark small-amplitude solitons in both normal and anomalous ...
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES
Molecular dynamics simulations were performed for 1-100eV particle bombardments of Si(001)-2×1 surface. The two dimensional pair correlation functions were obtained to investigate the arrangement of surface atoms after such bombardments. The results show that 10eV and 100eV bombardments had the some effects on the behaviour of surface atoms. On one hand, 10eV and 100eV bombardments improved the mo...
The Sn atom depth-profiles in the micro-phase region of the Al70Sn30 alloy surface for before and after the 27keV Ar+ ions bombardment have been studied using micro-beam Rutherford backscattering spectroscopy (M-RBS) analysis methods. The experimental results shown that the depth-profiles of the Sn atom between Al-rich phase region and Sn-rich phase region, and these phase regions locate on the un...
The thermal conductivity and thermal diffusivity of ZrO2 coatings were studied using arc-photothermal evaluation technique in which the sample was heated at front surface and detected at back surface, and finite-difference thermal flow model was applied. The values of thermal conductivity and thermal diffusivity of ZrO2 are k=0.0069J/cm·K·s and α=0.0028cm2/s, respectively. It is shown that, first,...
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
Based on the single-site electron correlation, the local approach has been used to investigate the ferromagnetic phase in the Hubbard-Hirsch model. Using the R =0,α approximation in second-order calculation, the electron Correlation effect on the phase diagram has been studied Carefully. Comparing with those of the R=0 approximation, the electron correlation effect becomes weaker due to taking int...
Exciton polaron states in C60 molecular are theoretically studied in the tight-binding approach supplemented by the extended Hubbard interaction. The binding energies of the lowest singlet and triplet excitons depend sensitively upon the electron correlation. Then the exciton polaron is formed due to the electron-lattice coupling. Relevent experiments in photo-luminescence spectrum of Cso can be e...
The temperature dependence of resistivity and magnetic susceptibility was measured for both BaSn1-xSbxO3-δ and Ba1-yLaySnO3-δ systems below room temperature. The results show that the mechanism of conduction is the variable range hopping for both systems at lower temperature. Whereas the two types of mechanism of conduction at higher temperature, are considered the nearest-neighbor hopping (Ba1-yL...
The a-Si: H/a-SiCx: H superlattices were fabricated by r. f. plasma CVD. The blue shift of optical bandgap and construction of the superlattices were present. The interface abruptness was determined by low-angle X-ray diffraction. The constant photocurrent method and IR measurement showed that there existed excess hydrogen and high concentration of Si-C bonds at a-Si:H/a-SiCx:H interfaces. The the...
Dependence of superconducting Tc upon Pr-substitution concentration x was studied systematically in R1-xPrxBa2Cu3O7-δ system with R=Nd, Dy, Tm, Yb and Lu. It was found that there is a Tc-plateau in the range of low x as R3+ radius ri≤ri(Dy). The Pr-concentration width corresponded by Tc-plateau exhibits a R3+ ion size effect. We suggest that the ion size effect of Tc-plateau might result from the...
The femtosecond pulsed laser and pump-probe method have been used to measure the transient change of reflectivity of YBa2Cu3O7-δ(δ=0.0, 0.1, 0.4 and 0.8) thin films. From the experimental curves the transient changes are found to be very different for samples with different oxygen content. The sign of the changes can be reversed as decreasing the oxygen content. It may be attributed to the changes...
The ferromagnetic state in quasi-one-dimensional organic ferromagnet poly-SIPO has been studied. We consider the electron hoping, electron-electron correlation and Pierls instability in one-dimensional system. And self-consistent calculations are performed to investigate the structure of energy band and the distribution of spin density. The effects of the above aspects on the ferromagnetic state a...
The γ-ray radiolytic defect in optical fiber has been studied by the electron spin resonance method. It is found that a series of paramagnetic defects have been formed by the γ-ray irradiation; the densities of the defect centers increase with the irradiation doses, and the types of defects are mainly the E′ center, the non-bridging oxygen hole center and the perody radical (OHC). The defects prod...
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY
The crystal phase, surface composition, particle shape and thermodynamic chaxacter of Ag ultrafine particle (UFP), which were prepared by sputtering in Ar gas, have been analysed by means of X-ray diffraction, X-ray photo-electron spectrum, transmission electron microscope (TEM) and differential scanning calorimeter. The results show that the particles with size larger than 4.6nm are composed of A...
Dynamic storage time has been measured for x=0.31 n-type Hg1-xCdxTe metal-insulator semiconductor (MIS) devices over temperature range of 68 to 250K. The theoretical calculations have been made in analysing the mechanisms of dark currents. The results point out that the indirect tunnel current, which involves a thermal transition of an electron from the valence band to a band-gap state followed by...
The time-resolve optical emission spectroscopy is used to study silane and methane laser plasma. The results show that the different fragments' characteristic lines has the same appearance time but different temporal behaviours when the reactant breaks down. Based on the experimental results of dissociation processes it is suggested that the producing of Si and C atoms is the main dissociation cha...
Coupled SU(5) Einstein-Yang-Mills-Higgs system is studied. A family of static spherical symmetric dyon soiutions and the space-time metrics of the Reissner-Nord-strom type are obtained. The solutions represent static dyon black holes with ma gnetic charge ±3/2e.
In this paper, we give an Euclidean wormhole solution in the vacuum Brans-Dicke theory, which is different from that obtained by Accetta et al. We show that this wormhole unlike all the others, it's throat dimension increases linearly with the increasing of the Euclidean cosmic time.