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Article
Cross Sections for the Production of He+ (np) 2P0 States by 50 to 150 keV Proton Impact on Helium
Physical Review A
  • Wayne C. Stolte, University of Nevada, Las Vegas
  • R. Bruch, University of Nevada, Reno
Document Type
Article
Publication Date
9-1-1996
Abstract
Cross sections have been measured for the production of He+ (np) 2Po states, n=2,3,4, by proton impact on helium over a projectile velocity range of 1.42–2.45 a.u. (50 ≤E≤150 keV). Cross sections were determined by measuring the extreme ultraviolet photons emitted from excited He1 ions. The data indicate a lower energy than expected for the maximum cross section. A comparison of the present results in terms of projectile energy dependance with the cross sections for excitation to He (1snp) 1Po, ionization, and total electron capture suggests the primary mechanism for the production of excited He+ at low energies is transfer excitation, with ionization excitation being the dominant mechanism at higher energies.
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Copyright American Physical Society, used with permission
Citation Information
Wayne C. Stolte and R. Bruch. "Cross Sections for the Production of He+ (np) 2P0 States by 50 to 150 keV Proton Impact on Helium" Physical Review A Vol. 54 Iss. 3 (1996) p. 2116 - 2120
Available at: http://works.bepress.com/wayne_stolte/28/