Rotational excitation of O2 by positron impact
| Autor: | Marcos V. Barp, Wagner Tenfen, F. Arretche |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Radiation 010308 nuclear & particles physics 01 natural sciences Method of continued fractions 030218 nuclear medicine & medical imaging 03 medical and health sciences Cross section (physics) 0302 clinical medicine Positron 0103 physical sciences Molecule Atomic physics Adiabatic process Excitation |
| Zdroj: | Radiation Physics and Chemistry. 179:109140 |
| ISSN: | 0969-806X |
| DOI: | 10.1016/j.radphyschem.2020.109140 |
| Popis: | We report the rotational excitation of O2 molecule by positron impact for energies between 0.01 and 5.0 eV. The T-matrices were obtained by the method of continued fractions within the positron correlation-polarisation potential considering different levels of polarisation description. The rotational cross sections were computed with T-matrices in conjunction with the adiabatic rotational approximation. Comparison of the results indicate that the more sophisticated polarisation potential framework slightly reshapes the cross section, as expected, since such enhancement in the polarisation does not directly alter the transition. Thus, the small increase is due the partial waves ( l i , m i ) = ( l f , m f ) , that are in accordance with the selection rules of the transition, which are affected by the more complete description of the polarisation potential. We also show how our results compare with the other positron correlation-polarisation potential data available in literature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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