Energy-Loss Measurements for Single and Multiple Ionization of Argon by Positron Impact

Abstract

Experimental data, as a function of projectile energy loss, are presented for single, double and triple ionization of argon by 750 eV positrons. These differential ionization yields are for positrons scattered into a forward cone of angles between O° and 17° and for energy losses up to 85% of the initial energy. The single ionization data are shown to be in good agreement with distorted wave Born calculations. For the angular range investigated the percentage of double ionization is found to increase rapidly for the first 80 eV of energy loss. The ratio then slowly approaches a constant value that is in good agreement with the ratios of total cross sections for photoionization of the M shell. The present energy-loss data also demonstrate the importance of outer versus inner-shell ionization in the double and triple ionization channels.

Department(s)

Physics

Keywords and Phrases

Electron energy loss spectroscopy; Electron scattering; Kinetic energy; Mathematical models; Numerical analysis; Photoionization; Positrons; Quantum theory; Born calculations; Energy loss measurements; Positron impact; Positron scattering; Shell ionization; Argon

International Standard Serial Number (ISSN)

0953-4075

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2001 Institute of Physics - IOP Publishing, All rights reserved.

Publication Date

01 Dec 2001

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