Electron-hydrogen-atom elastic and inelastic scattering with screened Coulomb interaction around the n=2 excitation threshold

Electron-hydrogen-atom elastic and inelastic scattering with screened Coulomb interaction around the n=2 excitation threshold
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电子-氢-原子弹性和非弹性散射,在 n=2 激发阈值附近具有屏蔽库仑相互作用

DOI:
10.1103/physreva.81.032707
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发表时间:
2010-03
期刊:
影响因子:
2.9
通讯作者:
Janev, R. K.
Janev, R. K.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang, Song Bin;Wang, Jian Guo;Janev, R. K.

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采用带假态的r -矩阵方法研究了库仑相互作用筛选对电子-氢原子弹性和n=2阈值附近激发散射的影响。当相互作用筛选长度D从{无穷大}变化到3.8 a.u时,由于{sup 1,3}S Feshbach共振收敛到不同的2s阈值,以及{sup 1,3}P和{sup 1}D Feshbach共振在D的某个临界值下分别越过2s和2p阈值时转变为形状型共振,弹性和激发碰撞强度发生了显著变化[S]。B. Zhang et al.;生物工程学报,2009,32(1)。给出了D={∞}-3.8 a.u.范围内大量D的共振参数。可以观察到,在共振超过临界D值后,{sup 1,3}P和{sup 1}D共振对弹性和激发碰撞强度的贡献随着D的减小而迅速减小。随着D的进一步减小,a {sup 1}S{sup e} Feshbach共振对弹性或激发碰撞强度的贡献在融入母体2s态并融入背景后变为一个尖峰。
The effects of Coulomb interaction screening on electron-hydrogen-atom elastic and excitation scattering around the n=2 threshold have been investigated by using the R-matrix method with pseudostates. The elastic and excitation collision strengths show dramatic changes when the interaction screening length D varies from {infinity} to 3.8 a.u., as a result of the convergence of {sup 1,3}S Feshbach resonances to the varying 2s threshold and of the transformation of {sup 1,3}P and {sup 1}D Feshbach resonances into shape-type resonances when they pass across the 2s and 2p threshold at certain critical value of D, respectively [S. B. Zhang et al., Phys. Rev. Lett. 104, 023203 (2010)]. The resonance parameters for a large number of D in the range D={infinity}-3.8 a.u. are presented. It is observed that the {sup 1,3}P and {sup 1}D resonance contributions to the elastic and excitation collision strengths decrease rapidly with decreasing D after the resonance passes the critical D value. The contribution of a {sup 1}S{sup e} Feshbach resonance to the elastic or excitation collision strength changes into a cusp after the resonance merges into its parent 2s state and immerses into the background with the further decrease of D.
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