Laser-assisted ionization-excitation of helium by electron impact at large momentum transfer

被引：7

作者：

Bulychev, Andrey A. ^{[1
]}

Kouzakov, Konstantin A. ^{[2
]}

机构：

[1] Joint Inst Nucl Res, Theoret Phys Lab, Dubna 141980, Russia

[2] Moscow MV Lomonosov State Univ, Fac Phys, Dept Nucl Phys & Quantum Theory Collis, Moscow 119991, Russia

来源：

EUROPEAN PHYSICAL JOURNAL D | 2014年 / 68卷 / 11期

基金：

俄罗斯基础研究基金会;

关键词：

WAVE-FUNCTIONS; COLLISIONS; ORBITALS; ATOMS; IONS;

D O I：

10.1140/epjd/e2014-50442-6

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Ionization of a helium atom by electron impact in the presence of laser radiation is studied theoretically. The kinematic regime of high impact energy and large momentum transfer is considered. The S-matrix of the process is treated within the first Born and binary-encounter approximations. Triple differential cross sections are calculated for the cases when the residual He+ ion is left both in the ground (n = 1) and in the first excited (n = 2) states in the presence of a laser field with frequency omega = 1.55 eV and intensity I = 5 x 10(11) W/cm(2). The laser-assisted cross sections corresponding to n = 2 are found to be more sensitive to the electron-electron correlations in helium than the field-free ones.

引用

页数：7

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