Document Type
Article
Publication Date
1-1993
Publication Title
Physical Review A
Volume
47
Issue
1
First page number:
R16
Last page number:
R19
Abstract
We report the ratio of double-to-single photoionization of He at several photon energies from 2 to 12 keV. By time-of-Aight methods, we find a ratio consistent with an asymptote at 1.5%±0.2%, essentially reached by h v≈4 keV. Fair agreement is obtained with older shake calculations of Byron and Joachain [Phys. Rev. 164, 1 (1967)], of Aberg [Phys. Rev. A 2, 1726 (1970)], and with recent many-body perturbation theory (MBPT) of Ishihara, Hino, and McGuire [Phys. Rev. A 44, 6980 (1991)]. The result lies below earlier MPBT calculations by Amusia et al. [J. Phys. B 8, 1248 (1975)] (2.3%), and well above semiempirical predictions of Samson [Phys. Rev. Lett. 65, 2861 (1990)], who expects no asymptote and predicts ơ(He2+)/ơ (He+) =0.3% at 12 keV.
Keywords
Helium; Photoionization of gases
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
Levin, J. C.,
Sellin, I. A.,
Johnson, B. M.,
Lindle, D. W.,
Miller, R. D.,
Azuma, Y.,
Berry, H. G.,
Lee, D.,
Berrah, N.
(1993).
High-energy Behavior of the Double Photoionization of Helium from 2 to 12 keV.
Physical Review A, 47(1),
R16-R19.
https://digitalscholarship.unlv.edu/chem_fac_articles/69
Included in
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