Two-electron transitions in slow collisions of N{sup 3+} ions with H{sub 2} and He
- Western Michigan Univ., Kalamazoo, MI (United States)
- Univ. of Wales, Swansea (United Kingdom)
High-resolution translational energy-gain spectra for single-electron capture by N{sup 3+} ions from H{sub 2} and He have been measured at laboratory impact energies between 6 and 15 keV. At an impact energy of 6 keV, the energy-gain spectra indicate that the dominant reaction channels are due to transfer excitation into the 2s2p{sup 2} states of N{sup 2+} from the (2s{sup 2} {sup 1}S) ground state N{sup 3+} ions. As the impact energy is increased, capture into 2s2p{sup 2} states of N{sup 2+} remains dominant, but contributions from pure single-electron capture processes from both the ground state and the (2s({sup 2}S)2p {sup 3}P) metastable state of N{sup 3+} are significantly increased. These results show the cross section for transfer excitation to be larger than the cross section for pure single-electron capture at the lower impact energies investigated, but decreases with increasing impact energy. The translational energy-gain spectra are interpreted qualitatively in terms of the reaction windows, which are calculated using the single-crossing Landau-Zener model and the extended version of the classical over-barrier model. Total and state-selective cross sections have also been measured and will be presented and compared with available measurements and theoretical calculations.
- OSTI ID:
- 394105
- Report Number(s):
- CONF-9605105--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 41; ISSN 0003-0503; ISSN BAPSA6
- Country of Publication:
- United States
- Language:
- English
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