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 tha...
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 p...
In this paper, our study on the hydrogen-bond ferroelectrics with Green's function method is reviewed. First we show how to apply the bose-type Green's function method properly to the pseudo-spin model. Then we introduce the four-body interaction in the pseudo-spin model in order to treat the first order phase transition. Analysing the equation describing the phase transition process, we propose a...
In the paper, we use the theory of orderdisorder transition to calculate the curves of long-range order parameter M vs composition y of B-site ions, and introduce a condition of charge balance between the area within ordering domain and one outside the domain to discuss its growth model with change of the composition y. The theoretical results are in agreement with experiment.
Theoretical analyses of the dependence of apparent fluorescence yield YF on molecular fluorescence quantum efficiency QE and molecular coverage have been made by using ‘Fourlevel' model. The experimental studies of apparent yield YF of SF and Rh6G molecules adsorbed on-chemically deposited silver island film are reported. The experimental results are in agreement with the theoretical expectation.
In this paper, hyper-Raman scattering intensities are calculated based on the quantum theory of radiation. From the intensity formulae, we can conclude directly that all Raman material that has vibration infra-red activity must have vibration hyper-Raman activity simultaneously. Because probability of dipole transition only contributes to anti-Stokes hyper-Raman scattering intensity, the intensity...
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 sampl...
In this paper, the spinless Fermi systems with arbitrary band filling have been studied by using the real-space renormalization group methods. For one dimensional case, we obtained the ground state energies, the correlation functions and the relative critical exponents of the systems. The results were compared with those of isotropic s = 1/2 X-Y model. We also discussed qualitatively the correlati...
The angular distribution of isotopic sputtering was studied theoretically and experimentally in this paper. A careful experiment was carried out, and a theoretical model was established. The result was that the light isotopes are preferential ejected "normally" and the heavy ones "obliquely". The reason was considered to oe the energy and momentum asymmetry between light and heavy isotopes in the ...
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 ionizatio...
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 ...
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.
Nonlinear effects of the gradient inhomogeneity of the magnetic field on the stochastic motion of charged particles due to an electrostatic wave propagated arbitarily relative to the magnetic field are considered in this paper. A sequence of canonical transformations is preformed to obtain a Hamiltonian explicitly exhibiting the possibility of the resonance between the periodic motion of particles...
In this paper, by mean of a quantum-mechanical treatment, we study the interaction of plasma with a coherent electromgnetic field inside a cavity. The eigenstates and eigenvalues of the Hamiltonian of this system is obtained. This eigenstates is the generalized squeezed coherent states. The formulas of the squeezing, anti-bunching, sub-Poisson statistics effects and measured phase operator of the ...
Based on MHD concepts, we explain and prove that a self-confined plasma ball imbeded in a constant pressure p0 can be in equilibrium as well as stable states. Besides, it is found that the equilibrium states can not be force-free configurations. The conclusion that the average pressure inside the plasmaball is less than p0 is drawn from the calculation. Furthermore, we point out that the condition...
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 stat...
The defect configuration relates directly to the mechanical behaviour of structural materials. Especially, dislocation substructure, DSS, is one of the most important configurations. In this paper, a realistic x-ray diffraction profile analysis of DSS, developed by Wang, is reviewed and illustrated. Its application to predicting quantitatively mechanical properties is made.
Target atom excitations in collisions of He+ and He2+ with Li have been studied by optical measurement in the energy range q×(20-150) keV. We have measured Lil 670.8 nm (2p→2s), Lil 610.4 nm (3d→2p), Lil 460.3 nm (4d→2p) and Lil 812.6 nm (3s→2p) emission lines by using an OMA system. The emission cross sections of the observed lines and corresponding Li(2p) excitation cross sections have been calc...
We have studied the target atom excitations in the collisions of He+ and He2+ with Na in the energy range ot q×(20-140) keV by optical measurements. The Nal 589.0 + 589.6 nm (3p→3s), Nal 818.3nm (3d→3p) and Nal 568.8 nm(4d→3p) lines for He+ + Na collision system have been observed by an OMA system. In He2+ + Na collision system, only Nal 589.0 + 589.6 nm line was observed. The emission cross secti...
The absorption edge of p-Hg1-xCdxTe with x = 0.7 has been measured at different pressures in the range of 0-36kbar and room temperature. The experimental energy gap is basically in agreement with the result calculated by empirical formula The first order pressure coefficient of Hg1-xCdx Te obtained by a least square fitting to experimental data under different pressures is a = 8.7×10-11eV/Pa, whic...
The indirect interaction between adatoms are studied by using tight-binding model and one-electron theory. We found that the introduction of impurity atom Cu makes the peak value of the interaction energies to increase, and the introduction of Co makes that value tp decrease. Using the relation between the indirect interaction energies and the relative positions of the adatoms, we explain the stru...
We report the experimental set-up and measurement system combining with a fast-scan Fourier transform spectrometer for photothermal ionization spectroscopy. They have been successfully applied for the investigation and detection of residual shallow impurity centers in ultra-pure germanium and silicon single crystals with high resolution as well as high sensitivity. Boron acceptor at a concentratio...
In this paper, the threshold of chaos in a forced vibration system with a square nonlinear term is given by using the Melnikov method. The effects of parameters on the threshold are analyzed. The known results obtained respectively by approximate 2-D iterated map and by numerically integrating the differential equation are compared with the results here.
In this paper the effect of gravitational radiation damping on the variation of the orbital elements of binary system is studied using the method of perturbation. This effect results in both the secular and periodic variation of the semimajor axis and the eccentricity, however, the longitude of periastron exhibits no secular variation, but only periodic variation In addition, the deduced expressio...
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].
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 st...
Quantitative information about tie growth-induced magnetic anisotropy in Y1G was obtained from M?ssbauer spectrum in a previous note. In order to study the origin of this anisotropy, M?ssbauer measurements were extended to low temperatures. We discover that below 170 k, Ku is negative, i-e., there is a spin reorientation. Calculations show that single-ion anisotropy of 0.01/Fe2+ may account for th...
Eu3+ ions at different crystal-field sites in SBN crystal are selectively pumped. From the time-resolved fluorescence spectra of 5D0→7F1, the energy transfer rates between ions in non-equivalent sites are evaluated. The dependence of fluorescence peak-frequency on the excitation wavenumber indicates the continuous distortion of local crystal field.