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Near-Threshold Ionization of Argon by Positron Impact

Babij, Tamara; Machacek, Joshua; Murtagh, Daniel; Buckman, Stephen; Sullivan, James


The direct single-ionization cross section for Ar by positron impact has been measured in the region above the first ionization threshold. These measurements are compared to semiclassical calculations which give rise to a power law variation of the cross section in the threshold region. The experimental results appear to be in disagreement with extensions to the Wannier theory applied to positron impact ionization, with a smaller exponent than that calculated by most previous works. In fact, in...[Show more]

CollectionsANU Research Publications
Date published: 2018
Type: Journal article
Source: Physical Review Letters
DOI: 10.1103/PhysRevLett.120.113401
Access Rights: Open Access


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