Solving close-coupling equations in momentum space without singularities for charged targets

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• 作者：A.W. Bray ; ¹ ; ^{alexander.w.bray@graduate.curtin.edu.au} ; I.B. Abdurakhmanov ; A.S. Kadyrov ; D.V. Fursa ; I. Bray
• 关键词：Electron&ndash ; atom scattering ; Electron&ndash ; ion scattering
• 刊名：Computer Physics Communications
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：212
• 期：Complete
• 页码：55-58
• 全文大小：595 K
• 卷排序：212

文摘

The analytical treatment of the Green’s function in the convergent close-coupling method (Bray et al., 2016) has been extended to charged targets. Furthermore, we show that this approach allows for calculation of cross sections at zero channel energy. For neutral targets this means the electron scattering length may be obtained from a single calculation with zero incident energy. For charged targets the non-zero excitation cross sections at thresholds can also be calculated by simply setting the incident energy to the exact threshold value. These features are demonstrated by considering electron scattering on H and He+ .