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国家自然科学基金(10974021)

作品数:7 被引量:5H指数:1
相关作者:王建国王学容刘晓菊李传莹孟广为更多>>
相关机构:北京应用物理与计算数学研究所中国科学院等离子体物理研究所陕西师范大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:理学更多>>

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Cross section of the impact single ionization of B^(2+) by H^+
2013年
The ionization process of B2+ by H+ impact is studied using the continuum-distorted-wave eikonal-initial-state (CDW-EIS) method and the modified free electron peak approximation (M-FEPA), respectively. Total, single-, and double- differential cross sections from ls and 2s orbitals are presented for the energy range from 10 keV/u to 10 MeV/u. Com- parison between the results from the two methods demonstrates that the total and single-differential cross sections for the high-energy incident projectile case can be well evaluated using the simple M-FEPA model. Moreover, the M-FEPA model reproduces the essential features of the binary-encounter (BE) bump in the double-differential cross sections. Thus, the BE ionization mechanism is discussed in detail by adopting the M-FEPA model. In particular, the double- and single- differential cross sections from the 2s orbital show a high-energy hip, which is different from those from the ls orbital. Based on Ref. [1], the Compton profiles of B2+ for ls and 2s orbitals are given, and the hips in DDCS and SDCS from the 2s orbital are explained.
叶丹丹祁月盈胡亚华宁丽娜
Fast-electron-impact ionization process by 3p of hydrogen-like ions in Debye plasmas被引量:1
2015年
The plasma screening of fast-electron-impact-ionization by excited state(3p) of Hydrogen-like ions was investigated in the first Born approximation with a plasma screening length δ varying from 1000a0 to 10a0. The generalized oscillator strength densities showed dramatic changes: some accessional minima occurred along with a remarkable enhancement in certain continuum-energy domains. The double-differential cross sections exhibit not only the same structures as the Bethe surface for moderate and large momentum transfers, but also a broadened enhancement for small momentum transfers.The single-differential cross sections exhibit a near-zero-energy-enhancement and prodigious multiple-shape resonances,depending on the continuum energy and the plasma screening length. These features are analogous to those of the photoionization cross section. These findings, for both types of cross section, can be explained by processes associated with continuum electrons, as long as the potential has a short-range character.
祁月盈叶丹丹王建国屈一至
Classical trajectory Monte Carlo investigation for Lorentz ionization of H (1s)
2013年
Lorentz ionization of H(1s) is investigated by classical trajectory Monte Carlo (CTMC) simulation. The effect of the transverse magnetic field on the considered process is analyzed in terms of the time evolution of interactions in the system, total electron energy, and electron trajectories. A classical mechanism for the ionization is found, where the variation of the kinetic energy of the nuclei is found to be important in the process. Compared with the results of tunneling ionization, the classical mechanism becomes more and more important with the increase of the velocity of the H-atom or the strength of the magnetic field.
何斌王建国刘春雷
强磁场下He^(2+)+H(1s)的碰撞电离微分截面及电离机理研究
2013年
应用经典径迹蒙特卡罗方法详细研究了强磁场环境下He(2+)+H(1s)的重粒子碰撞电离过程.首先得到了在不同强度的纵向和横向磁场下电离电子的一阶能量微分截面,发现它们不仅在数值上比未加磁场下的结果有明显的增加,而且随电离电子的能量变化不再是单调下降,而是呈现一定的峰值结构.通过对电离事例的分析,解释了这些变化形成的原因.其次由于强磁场会导致碰撞电离的物理机理有很大变化,因此也分析并解释了磁场强度、方向及入射粒子能量等因素对电离机理的影响行为.
丁丁何斌屈世显王建国
关键词:强磁场碰撞电离
Electron capture and dissociation in collision of H2+ with He
The electron capture and dissociation processes in H++He collision are investigated by the quantal molecular o...
R.K.Janev
文献传递
混合物物态方程的计算被引量:1
2011年
在采用体积相加原理计算混合物物态方程的基础上,建立了一种物理模型确定混合物温度。根据混合物中各组分温度和压强平衡条件,采用压强-密度迭代方法计算给出混合物物态方程,编制了两种组分的混合物物态方程计算程序。为检验建立的温度模型的合理性及程序的有效性,分析了不同密度、温度状态的氢(H2)和钨(W)组成的混合物状态参量,计算了以下情形及其组合情形的混合物物态方程:H2和W以不同质量比混合;质量比固定,单组分状态不同;温度区间和密度区间不同。研究表明:实际应用中在建立的混合物温度模型基础上确定的混合物物态方程是合理的。
王学容王建国
关键词:混合物
Static electric dipole polarizability of lithium atoms in Debye plasmas被引量:3
2012年
The static electric dipole polarizabilities of the ground state and n ≤ 3 excited states of a lithium atom embedded in a weekly coupled plasma environment are investigated as a function of the plasma screening radium. The plasma screening of the Coulomb interaction is described by the Debye-Hiickel potential and the interaction between the valence electron and the atomic core is described by a model potential. The electron energies and wave functions for both the bound and continuum states are calculated by solving the SchrSdinger equation numerically using the symplectic integrator. The oscillator strengths, partial-wave, and total static dipole polarizabilities of the ground state and n ≤ 3 excited states of the lithium atom are calculated. Comparison of present results with those of other authors, when available, is made. The results for the 2s ground state demonstrated that the oscillator strengths and the static dipole polarizabilities from np orbitals do not always increase or decrease with the plasma screening effect increasing, unlike that for hydrogen-like ions, especially for 2s→3p transition there is a zero value for both the oscillator strength and the static dipole polarizability for screening length D = 10.3106a0, which is associated with the Cooper minima.
宁丽娜祁月盈
类钠Ni17+离子双电子复合过程理论研究被引量:1
2010年
使用基于相对论多组态方法的FAC程序,研究了类钠Ni17+(3s)离子通过双激发态Ni16+(3pnl,3dnl)(Δn=0激发)的双电子复合过程,得到了态选择的双电子复合截面和速率系数,并与文献中的实验和理论数据进行了对比.结果发现,计算通过3p3/210l和3p1/211l共振态的双电子复合积分截面在实验误差范围内与实验测量很好地符合,并好于全相对论的多体微扰理论计算结果.结合量子亏损理论,发现包含高里德伯态的共振双激发态的辐射跃迁和自电离速率具有较好的标度关系,利用该关系给出了近激发阈值的所有共振态的双电子复合积分截面和速率系数.比较3pnl和3dnl两个系列,发现在低温(大约小于100eV)等离子体情况下前者速率系数比后者大,更高的温度后者大.
李传莹刘晓菊孟广为王建国
关键词:双电子复合过程量子亏损理论速率系数
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