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Journal of Spectroscopy
Volume 2013, Article ID 192917, 16 pages
Research Article

Double Differential Cross-Sections for Electron Impact Ionization of Atoms and Molecules

Department of Physics, e-COL Laboratory, Afyon Kocatepe University, 03200 Afyonkarahisar, Turkey

Received 31 May 2013; Revised 17 August 2013; Accepted 2 September 2013

Academic Editor: R. P. S. Chakradhar

Copyright © 2013 Mevlut Dogan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The single ionizing collision between an incident electron and an atom/molecule ends up two kinds of outgoing electrons called scattered and ejected electrons. As features of electron impact ionization, these two types of electrons are indistinguishable. Double differential cross-sections (DDCS) can be obtained by measuring the energy and angular distributions of one of the two outgoing electrons with an electron analyzer. We used He, Ar, H2, and CH4 targets in order to understand the ionization mechanisms of atomic and molecular systems. We measured differential cross-sections (DCS) and double differential cross-sections at 250 eV electron impact energy. The elastic DCSs were measured for He, Ar, H2, and CH4, whereas the inelastic DCSs of He were obtained for 21P excitation level for 200 eV impact electron energy.