(e,2e) measurements using a magnetic angle changer

M A Stevenson; Birgit Lohmann

doi:10.1016/j.elspec.2007.02.030

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(e,2e) measurements using a magnetic angle changer

Journal article

Peer reviewed

(e,2e) measurements using a magnetic angle changer

M A Stevenson and Birgit Lohmann

Journal of Electron Spectroscopy and Related Phenomena, Vol.161(1-3), pp.31-34

2007

DOI: https://doi.org/10.1016/j.elspec.2007.02.030

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Abstract

Atomic, Molecular, Nuclear, Particle and Plasma Physics

Physical Chemistry (incl. Structural)

argon

triple differential cross section (TDCS)

magnetic angle changer (MAC)

electron impact ionization

low energy electron

While measurements of triple differential cross sections (TDCS) for electron impact ionization have been performed for almost 40 years, the angular range of available data has generally been restricted due to physical constraints of the apparatus. We have overcome these constraints by incorporating a magnetic angle changer (MAC) into a conventional (e,2e) spectrometer. Use of a MAC in an (e,2e) experiment allows access to regions where as yet unobserved physical effects occur. One such example is where the scattered and ejected electrons emerge at the same angle, a region where the Coulomb repulsion between the two should be largest. This 'post-collision interaction' (PCI) is thought to play an important role in low energy electron impact ionization. We discuss recently published data for TDCS of the inner valence shell 3s ionization of argon measured over the backward scattering direction. We also present new data for outer shell 3p ionization of argon over the full angular range in the scattering plane, including the region where scattered/ejected electrons emerge at the same angle. To our knowledge, this is the first reported TDCS over the complete 360â—¦ angular range using a conventional (e,2e) spectrometer.

Details

Title: (e,2e) measurements using a magnetic angle changer
Authors: M A Stevenson (Author) - Griffith University
Birgit Lohmann (Author) - Griffith University
Publication details: Journal of Electron Spectroscopy and Related Phenomena, Vol.161(1-3), pp.31-34
Publisher: Elsevier BV
Date published: 2007
DOI: 10.1016/j.elspec.2007.02.030
ISSN: 0368-2048
Organisation Unit: Office of the Deputy Vice-Chancellor (Academic); University of the Sunshine Coast, Queensland; Thompson Institute
Language: English
Record Identifier: 99449662002621
Output Type: Journal article

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