Cross Sections for the Production of He+ (np) 2P0 States by 50 to 150 keV Proton Impact on Helium

Authors

Wayne C. Stolte, University of Nevada, Las VegasFollow
R. Bruch, University of Nevada, RenoFollow

Document Type

Article

Publication Date

9-1996

Publication Title

Physical Review A

Volume

54

Issue

3

First page number:

2116

Last page number:

2120

Abstract

Cross sections have been measured for the production of He⁺ (np) ²P^o 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) ¹P^o, 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.

Keywords

Electronic excitation; Helium; Ionization; Photoionization cross sections

Disciplines

Analytical Chemistry | Atomic, Molecular and Optical Physics | Biological and Chemical Physics | Elementary Particles and Fields and String Theory | Physical Chemistry

Language

English

Permissions

Copyright American Physical Society, used with permission

Repository Citation

Stolte, W. C., Bruch, R. (1996). Cross Sections for the Production of He+ (np) 2P0 States by 50 to 150 keV Proton Impact on Helium. Physical Review A, 54(3), 2116-2120.
https://digitalscholarship.unlv.edu/chem_fac_articles/43