Kinetic theory of positron-impact ionization in gases

Boyle, G.J., Tattersall, W.J., Cocks, D.G., Dujiko, S., and White, R.D. (2015) Kinetic theory of positron-impact ionization in gases. Physical Review A (Atomic, Molecular and Optical Physics), 91 (5). 052710. pp. 1-13.

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A kinetic theory model is developed for positron-impact ionization (PII) with neutral rarefied gases. Particular attention is given to the sharing of available energy between the postionization constituents. A simple model for the energy-partition function that qualitatively captures the physics of high-energy and near-threshold ionization is developed for PII, with free parameters that can be used to fit the model to experimental data. By applying the model to the measurements of Kover and Laricchia [Phys. Rev. Lett. 80, 5309 (1998)] for positrons in H₂, the role of energy partitioning in PII for positron thermalization is studied. Although the overall thermalization time is found to be relatively insensitive to the energy partitioning, the mean energy profiles at certain times can differ by more than an order of magnitude for the various treatments of energy partitioning. This can significantly impact the number and energy distribution of secondary electrons.

Item ID: 42974
Item Type: Article (Research - C1)
ISSN: 1094-1622
Funders: Australian Research Council's Centre of Excellence Discovery Program (ARC-CEDP)
Projects and Grants: MPNTRRS Project OI171037, MPNTRRS Project III41011
Date Deposited: 03 Mar 2016 23:11
FoR Codes: 02 PHYSICAL SCIENCES > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020201 Atomic and Molecular Physics @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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