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Resonant Scattering of Positronium in Collision with CO2

Brawley, SJ; Williams, AI; Shipman, M; Laricchia, G; (2010) Resonant Scattering of Positronium in Collision with CO2. PHYS REV LETT , 105 (26) , Article 263401. 10.1103/PhysRevLett.105.263401. Green open access

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Abstract

The total cross sections of positronium (Ps) scattering from a carbon-dioxide molecule have been measured over the range (7-400) eV incident-Ps energy. For the first time in Ps collisions, a resonantlike structure is observed. For the present target, it occurs around 9.5 eV followed by a broader peak at similar to 60 eV. Following Brawley et al. [Science 330, 789 (2010)] who have observed similarities between the total cross sections of positronium and of electrons incident upon a given target at the same velocity, a corresponding comparison is made for CO2. The comparison suggests that the former peak corresponds to the well-known (2)Pi(u) shape resonance which occurs for electrons at an incident velocity of 0.5 a.u. Further features are discussed and theoretical input is sought.

Type: Article
Title: Resonant Scattering of Positronium in Collision with CO2
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.105.263401
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.105.263401
Language: English
Additional information: © 2010 The American Physical Society
Keywords: DIFFERENTIAL CROSS-SECTIONS, CARBON-DIOXIDE, VIBRATIONAL-EXCITATION, ELECTRON-SCATTERING, GAS COLLISIONS, PS BEAM, ATOMS, MOLECULES, IMPACT
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/1299703
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