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Near-threshold ionization of He and H-2 by positron impact

Ashley, P; Moxom, J; Laricchia, G; (1996) Near-threshold ionization of He and H-2 by positron impact. Physical Review Letters , 77 (7) 1250 - 1253. 10.1103/PhysRevLett.77.1250. Green open access

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Abstract

The single ionization cross sections for He and H-2 by positron impact have been measured in the first few eV above threshold and found to exhibit a different energy dependence from the corresponding electron results. If the data, between 1 and 3 eV above threshold, are fitted by a power law, exponents of 1.99 +/- 0.19 and 1.70 +/- 0.11 are obtained for He and H-2, respectively. This agrees qualitatively with extensions of the Wannier theory in that the exponent is larger than for electron impact. The quantitative disagreement with the predicted value of 2.65 might indicate that the range of validity of this theory is smaller than expected.

Type: Article
Title: Near-threshold ionization of He and H-2 by positron impact
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.77.1250
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.77.1250
Language: English
Additional information: © 1996 The American Physical Society
Keywords: ELECTRON-ATOM IONIZATION, SINGLE IONIZATION, CROSS-SECTIONS, LAW, AR, HYDROGEN, HELIUM, FRAGMENTATION, BEHAVIOR
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1339278
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