检索结果-南通市图书馆

Study of(e,2e) process on potassium at 6 e V-60 eV above threshold in a second-order Born approximation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese physics B 2012年第8期21卷 197-201页

作者：王旸周雅君焦利光 center for theoretical Atomic and Molecular physics Academy of Fundamental and Interdisciplinary SciencesHarbin Institute of Technology

The standard distorted wave Born approximation （DWBA） method has been extended to second-order Born amplitude in order to describe the multiple interactions between the projectile and the atomic target. Second-order DWBA calculations have been preformed to investigate the triple differential cross sections （TDCS） of coplanar doubly symmetric （e, 2e） collisions for the alkali target potassium at excess energies of 6 eV-60 eV. Compared with the previous first-order DWBA calculations, the present theoretical model improves the degree of agreement with experiments, especially for the backward scattering angle region of TDCS. This indicates that the present second-order Born term is capable of giving a reasonable correction to the DWBA model in studying coplanar symmetric （e, 2e） problems in low and intermediate energy ranges.

关键词： second-order Born approximation (e 2e) collisions potassium triple differential cross section

Momentum-space calculation of electron-CO elastic collision

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2013年第2期22卷 214-217页

作者：王远成马佳周雅君 center for theoretical Atomic and Molecular physics Academy of Fundamental and Interdisciplinary Sciences Harbin Institute of Technology

We report a momentum-space study on low-energy electron-CO *** differential cross sections（DCS） are obtained using a static-exchange-optical（SEO） model for the incident energies of 2,3,5,and 10 *** effect of higher reaction channels,including the ionization continuum,on the elastic collision is represented by an ab initio equivalent-local optical *** cross sections are compared with experimental measurements and other theoretical results.

关键词： electron scattering carbon monoxide differential cross section

Unnatural parity resonance states in positron-excited hydrogen scattering

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2012年第12期21卷 207-211页

作者：马佳周雅君王远成 center for theoretical Atomic and Molecular physics Academy of Fundamental and Interdisciplinary SciencesHarbin Institute of Technology

The coupled-channels optical method for positron scattering has been applied to investigate resonance states with unnatural parities in a positron-excited hydrogen system. The positronium formation channels and continuum channel are included via a complex equivalent local potential. Resonance states with angular momenta L =- 1 to L = 2 and parities （-1）L＋1 are calculated. Resonance energies and widths are reported and compared with other theoretical calculations. We found that the opening positronium formation channels play an important role in forming nondipole Feshbach resonances.

关键词： positrons excited-hydrogen atom unnatural parity resonances positronium coupled-channels optical method

Quantum and semiclassical studies on photodetachment cross sections of H^- in a harmonic potential

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2016年第3期25卷 150-155页

作者：赵海军刘伟龙杜孟利 School of physics and information Science and center for Molecules Research Shanxi Normal University State Key Laboratory of theoretical physics Institute of Theoretical PhysicsChinese Academy of Sciences

The photodetachment cross section of H- in a linear harmonic oscillator potential is investigated. This system pro- vides a rare example that can be studied analytically by both quantum and semiclassical methods with some approxi- mations. The formulas of the cross section for different laser polarization directions are explicitly derived by both the traditional quantum approach and closed-orbit theory. In the traditional quantum approach, we calculate the cross sections in coordinate representation and momentum representation, and get the same formulas. We compare the quantum formulas with closed-orbit theory formulas, and find that when the detachment electron energy is larger than hco, where co is the frequency of the oscillator potential, the quantum results are shown to be in good agreement with the semiclassical results.

关键词： photodetachment harmonic oscillator potential closed-orbit theory

Second-Order Born Effect in Single Ionization of Argon by Electron Impact

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2012年第1期29卷 102-104页

作者： WANG Yang ZHOU Ya-Jun JIAO Li-Guang center for theoretical Atomic and Molecular physics Academy of Fundamental and Interdisciplinary SciencesHarbin Institute of TechnologyHarbin 150080

We extend the standard distorted wave Born approximation(DWBA)to include the second-order Born amplitude in order to describe the multiple interactions between a projectile and an atomic *** the first-and secondorder DWBA models are used to calculate triply differential cross sections(TDCS)of coplanar(e,2e)on atomic argon with the scattered electron energy fixed at 500eV,the scattering angle at 6°and the ejected electron energies at 37,74 and 205 e *** agreements with experimental measurements have been obtained in shape,and the second-order DWBA model improves the calculations as expected,especially for recoil peak of TDCS.

关键词： Electron scattered distorted

Electronic Excitation of H_(2) by Electron Impact Using Multichannel Static-Exchange-Optical Method

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese physics Letters 2013年第7期30卷 64-67页

作者： WANG Yuan-Cheng MA Jia ZHOU Ya-Jun center for theoretical Atomic and Molecular physics Academy of Fundamental and Interdisciplinary SciencesHarbin Institute of TechnologyHarbin 150081

The momentum-space multichannel static-exchange-optical model is applied to the electron-H_(2) collision at the two-state close-coupling *** cross sections for X^(1)Σ_(g) to b^(3)Σ_(u) transition at the energies of 20 and 30 eV are *** are compared with other theoretical results and experimental *** scattering cross sections are also presented and compared with other work.

关键词： level. Electron momentum

Exact Solution of Two-Site Bose–Hubbard Model with Generic Open Boundaries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in theoretical physics 2015年第12期64卷 653-658页

作者：辛志荣杨涛郝昆杨文力 Institute of Modern physics Northwest University Beijing center for Mathematics and information interdisciplinary sciences

The Bose–Hubbard model is a paradigm for the study of strongly correlated bosonic systems. We study the two-site Bose–Hubbard model with generic integrable open boundaries specified by the most general non-diagonal reflecting matrices. Besides the inhomogeneous parameters,the model itself has three free boundary parameters,which break the U(1)-symmetry,in other words,break the particle number conservation. The Hamiltonian H under these circumstances is constructed. With the help of the off-diagonal Bethe Ansatz method,we successfully obtain the corresponding Bethe Ansatz equations as well as the eigenvalues.

关键词： quantum tunneling open spin chain high spin Bethe

Global Existence,Uniqueness and Pathwise Property of Solutions to a Stochastic Rssler-Lorentz System

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2015年第1期36卷 105-124页

作者： Song JIANG Junping YIN Institute of Applied physics and Computational Mathematics Beijing center for Mathematics and information interdisciplinary sciences

The authors integrate two well-known systems, the Rssler and Lorentz systems,to introduce a new chaotic system, called the Lorentz-Rssler system. Then, taking into account the effect of environmental noise, the authors incorporate white noise in both Rssler and Lorentz systems to have a corresponding stochastic system. By deriving the uniform a priori estimates for an approximate system and then taking them to the limit,the authors prove the global existence, uniqueness and the pathwise property of solutions to the Lorentz-Rssler system. Moreover, the authors carried out a number of numerical experiments, and the numerical results demonstrate their theoretic analysis and show some new qualitative properties of solutions which reveal that the Lorentz-Ro¨ssler system could be used to design more complex and more secure nonlinear hop-frequence time series.

关键词： Stochastic differential equations Rossler-Lorentz systems Existence Pathwise property

Anomalous boundary deformation induced by enclosed active particles

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2017年第10期26卷 82-88页

作者：田文得顾燕郭永坤陈康 center for Soft Condensed Matter physics & interdisciplinary Research College of Physics Optoelectronics and EnergySoochow University Kavli Institute for theoretical physics China Chinese Academy of Sciences

We simulate a two-dimensional model of a round soft boundary enclosed with self-propelled particles. Persistent motion drives these particles to accumulate near the boundary, thereby dramatically deforming the boundary shape through collisions. Quantitative analyses of the boundary shape and the particle distribution show that there are two typical regimes in the variation of the morphology with the increase of self-propulsion of particles. One is under small forces, characterized by the radially inhomogeneous distribution of particles and the suppression of local fluctuations of the almost round boundary, and the other is under large forces, featured by the angularly inhomogeneous distribution of particles and the global shape deformation of the boundary. These two features are strongly cooperative. We also find different mechanisms in the particle relocation at low and high particle concentrations.

关键词： self-propelled particles boundary active matter confinement