Single-electron capture processes in slow collisions of He{sup 2+} ions with O{sub 2}, NH{sub 3}, N{sub 2}, and CO{sub 2}
- Physics Department, Western Michigan University, Kalamazoo, Michigan 49008 (United States)
- Hahn-Meitner Institut Berlin, Glienickerstrasse 100, D-14109 Berlin (Germany)
Using the translational energy-gain spectroscopy technique, we have measured the energy-gain spectra and absolute total cross sections for single-electron capture (SEC) in collisions of He{sup 2+} ions with O{sub 2}, NH{sub 3}, N{sub 2}, and CO{sub 2} at laboratory impact energies between 25 and 400 eV/amu. The measured spectra for the He{sup 2+}-N{sub 2} and CO{sub 2} collision systems show that the dominant reaction channel is due to dissociative transfer ionization (i.e., SEC accompanied by ionization of the molecular target ion). In the case of the He{sup 2+}-NH{sub 3} collision system, nondissociative single-electron capture into n=2 states of He{sup +} with production of NH{sub 3}{sup +} in the ground state is predominantly populated. These processes are observed to be the dominant reaction channels over the entire impact energy region studied and at laboratory scattering angles between 0 deg. and 8 deg. The energy dependence of total cross sections for SEC are also measured and found to slowly increase with increasing impact energies. The measured cross sections are also compared with the available measurements and theoretical results based on the Demkov and Landau-Zener models.
- OSTI ID:
- 20718737
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 72; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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