Analytical Absorption Cross-Section for Photon by a Hydrogen 2s Atom

被引：1

作者：

Ndinya, Boniface Otieno ^{[1
]}

Okeyo, Stephen Onyango ^{[1
]}

机构：

[1] Maseno Univ, Dept Phys & Mat Sci, Maseno, Kenya

来源：

COMMUNICATIONS IN THEORETICAL PHYSICS | 2011年 / 55卷 / 04期

关键词：

absorption cross-section; Cooper pair minimum and Baker-Hausdorf expansion;

D O I：

10.1088/0253-6102/55/4/26

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We calculate the absorption cross-section for photon by a hydrogen 2s atom using the quantum-classical approximation for the total photo cross-section of many electron atoms. With the application of the first-order term of the Baker-Hausdorf expansion, the absorption cross-section for the hydrogen 2s atom decreases to aminimum, the Cooper pair minimum, at low photonenergy. Such a minimum is absent in the exact absorption cross-section for photon by a hydrogen 2s atom. We have extended the calculation for the absorption cross-section of the hydrogen 2s atom using the quantum-classical approximation for the total photo cross-section of many electron to include the second-order term of the Baker-Hausdorf expansion and observed a great reduction in the dip associated with the Cooper pair minimum at the zero crossing.

引用

页码：659 / 661

页数：3