Double- and single-electron transfer in H{sup +}+K collisions from 0.3 to 4keV: Separation of direct double transfer and two-step successive single-electron transfer
- College of Integrated Arts and Sciences, Osaka Prefecture University, Gakuen-cho 1-1, Sakai, Osaka, 599-8531 (Japan)
Double-electron transfer and two-step single-electron transfer in collisions of proton with potassium-metal target are measured in the collision energy from 0.3 to 4 keV by using a charge-inversion mass spectrometry. Two prominent H{sup -} ion peaks are observed with different values of the energy loss and show different target density dependences. The peak with larger energy loss is identified as double-electron transfer and the other as two-step successive single-electron transfer from the analysis of the target density dependence. The two-step single-electron transfer is considered to occur as the process accompanying spontaneous Ly-{alpha} emission, followed by negative H{sup -} formation. A theoretical analysis is also carried out, and the single-electron transfer cross section obtained is found to be in excellent agreement with the present measurement, while the present measurement for double-electron transfer is found to be much smaller than those evaluated earlier and the present theory.
- OSTI ID:
- 20645898
- Journal Information:
- Physical Review. A, Vol. 70, Issue 2; Other Information: DOI: 10.1103/PhysRevA.70.022708; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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