Nondipole parameters of TDCS for electron impact ionization and drag current

• Authors: Arkadiy Baltenkov , Steven Manson , Alfred Msezane
• Languages of publication: EN

Abstracts

EN

A comprehensive study is undertaken of angular distributions of electron knock-out from atomic targets by fast electrons with a small transfer of momentum. The general expressions for the parameters of the triple differential cross-section of impact ionization in the optical limit are derived. The calculated parameters are compared with those of the angular distribution of electrons ejected from an atom in the process of photoionization. In these processes, when the multipole transitions are involved, the one-to-one correspondence between the photoionization and impact ionization parameters disappears. The nondipole transitions lead to the backward/forward asymmetry of the angular distribution of ejected electrons that is absent in the dipole approximation for ionization by both fast electrons and photons. Using the He atom as an example, the character of the asymmetry for these two processes is qualitatively different and the backward/forward asymmetry results in macroscopic directed motion of secondary electrons accompanying the passing of a fast electron beam through gas or plasma. The general formulas for this drag current are derived and applied to gaseous He.

Keywords

EN

Impact ionization; triple differential cross-section; back/forward asymmetry; non-dipole parameters; drag current

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2011
• Volume: 9
• Issue: 5
• Pages: 1209-1220

Dates

published

1 - 10 - 2011

online

15 - 9 - 2011

Contributors

author

Arkadiy Baltenkov

• Arifov Institute of Electronics, 100125, Tashkent, Uzbekistan

author

Steven Manson

• Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia, 30303, USA

author

Alfred Msezane

• Center for Theoretical Studies of Physical Systems, Clark Atlanta University, Atlanta, Georgia, 30314, USA

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Identifiers

DOI

10.2478/s11534-011-0046-z