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Simultaneous Ionization and Excitation of Molecules by Positron Impact

Cooke, DA; Murtagh, DJ; Laricchia, G; (2010) Simultaneous Ionization and Excitation of Molecules by Positron Impact. PHYS REV LETT , 104 (7) , Article 073201. 10.1103/PhysRevLett.104.073201. Green open access

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Abstract

Cross sections for ionization excitation of molecules by positron impact have been measured for the first time by scattering a positron beam from CO2 and N-2. The cross sections have been observed to exceed those for electron impact by up to a factor of similar to 3 for CO2 and similar to 5 for N-2. The enhancement arises primarily via positronium formation. The cross sections account for up to similar to 12% and 20% of the total cross sections for positron scattering from N-2 and CO2, respectively.

Type: Article
Title: Simultaneous Ionization and Excitation of Molecules by Positron Impact
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.104.073201
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.104.073201
Language: English
Additional information: © 2010 The American Physical Society
Keywords: EMISSION CROSS-SECTIONS, ELECTRON-IMPACT, DISSOCIATIVE IONIZATION, OSCILLATOR-STRENGTHS, CONTINUUM PHOTOABSORPTION, CARBON-DIOXIDE, CO2, SCATTERING, COLLISIONS, THRESHOLD
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/115597
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