In order to explore the range of applicability of the classical trajectory Monte Carlo technique concerning the phenomena associated with light-particle impact of atoms and molecules we present calculations of the singly and doubly differential cross sections for 100 eV electron and positron impact of He and H2 Through comparison with experimental measurements it is noted in what regimes of ejection energy and angle the classical model describes reasonably the process of ionization by electrons. We find that reasonable agreement is obtained regarding the integrated (singly differential and total) cross sections while the features of the doubly differential cross section which evidently come about due to quantum mechanical aspects of the collision are not reproduced. In these instances the classical cross sections reflect an averaging over electron angles and energies of the observed doubly differential cross sections. Difficulties associated with the classical model of the many electron atom which arise specifically in light-particle impact are discussed as well as a comparison with a distorted wave Born approximation for electron impact of helium. © 1992 IOP Publication Ltd.



International Standard Serial Number (ISSN)

1361-6455; 0953-4075

Document Type

Article - Journal

Document Version


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Publication Date

14 Nov 1992

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Physics Commons