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Photoabsorption cross sections of the alkaline-earth-metal elements under strong interaction conditions

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Chinese Physics B 2011年第6期20卷 441-446页

作者：刘萌萌马晓光 Department of Physics Ludong University

The strong interatomic interaction effects on photoabsorption cross sections of a private atom have been interpreted by the contribution of both the real and imaginary parts of atomic polarizability in the present work. Some unresolved differences between the photoabsorption cross sections of isolated atoms and those of condensed atoms, especially near thresholds and resonances, probably could be interpreted by the competition between the imaginary and real parts of atomic frequency-dependent polarizabilities.

关键词： condensed-phase photoabsorption complex polarizability alkaline-earth-metal elements

Theoretical study on the complexes of He,Ne and Ar

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Chinese Physics B 2010年第12期19卷 161-167页

作者：童小菲杨传路肖静王美山马晓光 School of Physics Ludong University

This paper investigates the effect of basis sets through the potential energy curves （PECs） of six rare gas complexes He2, Ne2, Ar2, HeiNe, He-Ar, and Ne-Ar. The coupled cluster singles and doubles method with perturbative treatment of triple excitations, doubly augmented basis sets of d-aug-cc-pVQZ, bond functions, and basis set superposition errors are employed. The diffuse function is more effective than the polarization function on describing the dissociation energy. The PECs are fitted into analytical potential energy functions （APEFs） using three expressions. It is found that all the expressions are suitable for describing the complexes of rare gases. Based on these APEFs, the spectroscopic parameters are calculated and the results are compared with the theoretical and experimental data available in the literature.

关键词： potential energy curve analytical potential energy function spectroscopic parameter

Tight focus of a radially polarized and amplitudemodulated annular multi-Gaussian beam

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Chinese Physics B 2011年第11期20卷 291-295页

作者：陈建农徐钦峰王刚 School of Physics Ludong University School of Electrical and Electronic Engineering Ludong University

The focusing of a radially polarized beam without annular apodization ora phase filter at the entrance pupil of the objective results in a wide focus and low purity of the longitudinally polarized component. However, the presence of a physical annular apodization or phase filter makes some applications more difficult or even impossible. We propose a radially polarized and amplitude-modulated annular multi-Gaussian beam mode. Numerical simulation shows that it can be focused into a sharper focal spot of 0.125λ2 without additional apodizations or filters. The beam quality describing the purity of longitudinally polarized component is up to 86%.

关键词： focusing polarization laser beam

Geometrical,energetic and electronic properties of Au_n-(C_3H_6O)_m complexes(n = 3,5,m≤n):A density functional theory study

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Chinese Physics B 2010年第8期19卷 364-373页

作者：李迎春杨传路孙美玉李晓霞安义鹏王美山 School of Physics Ludong University

The interactions of acetone molecules with clusters of Au3 and Au5 are investigated by using a density functional theory （DFT） within a generalized gradient approximation （GGA）. The geometries, adsorption energies and deformation electron density distributions are used to analyse these interactions. The present calculations show that more than one acetone molecules can be adsorbed onto small gold clusters, and this adsorption is different from that of single molecule absorption. The coordination number of the adsorption site on the gold cluster is the dominant factor responsible for the strength of the interactions. The effects of the Au O bond lengths in the complexes on adsorption energies between Au clusters and acetone molecules are also examined.

关键词： acetone molecule gold cluster complex adsorption

Density-dependent photoabsorption cross sections of atomic Xe

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Chinese Physics B 2009年第1期18卷 161-166页

作者：马晓光 Department of Physics Ludong University

The evolution of the photoabsorption cross sections of atomic xenon with number densities varying from ideal gas to condensed matter has been studied by an alternative view in the present work. The alternative expressions of the photoabsorption cross sections presented by Sun et al recently were used with the local field models that has proven to be generalized easily to multiatoinic systems including molecules and condensed phase systems. The present results show that the variation of the photoabsorption cross sections of atomic xenon in the giant resonance region from the isolated to the condensed conditions is very small, which agrees well with the variation law of the solid and gas experiments.

关键词： condensed-phase photoabsorption local field xenon

The influence of interface modifier on photodetachment of negative ions in an electric field near a metal surface

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Chinese Physics B 2011年第7期20卷 133-141页

作者：黄凯云王德华 School of Physics Ludong University

Based on closed-orbit theory, the influence of an interface modifier on the photodetachment of H^- in an electric field near a metal surface is studied. It is demonstrated that the interface strengthens the oscillations in the photodetachment cross section. However, when the electric field environments are different, the strengthening oscillations are caused by different sources. When the electric field direction is upward, the interface enhances the oscillations by shortening the period and the action of the closed orbit. When the electric field direction is downward, the interface strengthens the oscillations either by extending the coherent energy range or by increasing the total number of the closed orbits. We hope that our results will be conducive to the understanding of the photodetachment process of negative ions near interfaces, cavities and ion traps.

关键词： photodetachment interface closed orbit theory

Capsizing Probability of Dead Ship Stability in Beam Wind and Wave for Damaged Ship

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China Ocean Engineering 2019年第2期33卷 245-251页

作者： HU Li-fen ZHANG Ke-zheng LI Xiao-ying CHANG Run-xin School of Transporation Ludong University

The International Maritime Organization has developed the second-generation intact stability criteria. Thus, damage stability criteria can be established in the future. In order to identity the capsizing probability of damaged ship under dead ship condition, this paper investigates two methods that can be used to research the capsizing probability in time domain, which mainly focus on the nonlinear righting lever GZ curve solution. One method subjects the influence of damaged tanks on the hull shape down to the wind and wave, and the other method is consistent with the real-time calculation of the GZ curve. On the basis of one degree of freedom rolling equation, the solution is Monte Carlo method, and a damaged fishery bureau vessel is taken as a sample ship. In addition, the results of the time-domain capsizing probability under different loading conditions are compared and analyzed. The relation of GM and heeling angle with the capsizing probability is investigated, and its possible reason is analyzed. On the basis of combining the time-domain flooding process with the capsizing probability calculation, this research aims to lay the foundation for the study of capsizing probability in time domain under dead ship condition, as well as provide technical support for capsizing mechanism of dead ship stability and damage stability criteria establishment in waves.

关键词： damage stability criteria dead ship stability capsizing probability flooding process time domain

Variation of photoabsorption cross section of atomic silver from isolated to condensed conditions

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Chinese Physics B 2009年第4期18卷 1451-1457页

作者：马晓光龚玉兵曲照军 Department of Physics Ludong University

The influence of the local-field on the photoabsorption cross section of the atomic silver is studied in detail by using the Clausius-Mossotti （CM） model and the Onsager model separately. The variations of the photoabsorption cross section of atomic silver with number density and radius of the environmental interaction cavity are studied systematically by using more general expressions for the photoabsorption cross sections, proposed by Sun et al recently. It has proved to be reasonable to model the optical response properties of bulky material by coupling the property of isolated atom with the environmental effects in the present work.

关键词： condensed-phase photoabsorption local field dielectric constant silver

Influence of rotational excitation and collision energy on the stereo dynamics of the reaction:N(~4S)+H_2 (v=0,j=0,2,5,10)→NH(X^3Σ^-)+H

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Chinese Physics B 2011年第12期20卷 217-226页

作者：于永江徐强徐秀玮 School of Physics Ludong University

The N＋H2 reaction has attracted a great deal of attention from both the experimental and the theoretical community, and most of the attention has been paid to the first excited state N （2 D） atoms in collisions with hydrogen molecules and the scalar properties of the reaction. In this paper, we study the stereo dynamical properties and calculate the reaction cross sections of the N（4S）＋ H2 （v=0, j=0, 2, 5, 10） → NH（X3∑-）＋ H using the quasi-classical trajectory （QCT） method on an accurate NH2 potential energy surface （PES） reported by Poveda and Varandas [Poveda L A and Varandas A J C 2005 Phys. Chem. Chem. Phys. 7 28671, in a collision energy range of 25 ***-1 -140 ***-1. Results indicate that the reactant rotational excitation and initial collision energy both have a considerable influence on the distributions of the k-j＇ correlation, the k-k＇-j＇ correlation and k-k＇ correlation. The differential cross section is found to be sensitive to collision energy.

关键词： quasi-classical trajectory method vector correlation differential cross section