Title

Low-energy electron-impact ionization of the helium atom using the multiconfiguration Hartree-Fock method

Authors

Authors

H. P. Saha

Comments

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Abbreviated Journal Title

Phys. Rev. A

Keywords

DIFFERENTIAL CROSS-SECTIONS; NEAR-THRESHOLD; ANGULAR-DISTRIBUTIONS; HYDROGEN-ATOMS; SCATTERING; Optics; Physics, Atomic, Molecular & Chemical

Abstract

We have extended the multiconfiguration Hartree-Fock method for electron-impact ionization of atoms to investigate the effects of polarization and electron correlation of the target in the initial state. As a test case, the method is applied to calculate triple differential cross sections for electron-impact ionization of He atom at an excess energy of 2 eV for the coplanar theta(12) = pi geometry for equal and unequal energies of two final-state outgoing electrons. To determine the effects of electron correlation between the two outgoing electrons in the final state, the variationally determined screening potential approximation is used. It is found that target correlation in the initial state has smaller effect on the triple differential cross section but the polarization of the target by the incident electron has considerable effect on the triple differential cross section at low incident energy. The results are compared with absolute measurement and other available theoretical results.

Journal Title

Physical Review A

Volume

82

Issue/Number

4

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

7

WOS Identifier

WOS:000282747800008

ISSN

1050-2947

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