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.
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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 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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