Measurement of the Ratio of Double-to-Single Photoionization of Helium at 2.8 keV Using Synchrotron Radiation

Authors

Jon C. Levin, University of Tennessee - KnoxvilleFollow
Dennis W. Lindle, University of Nevada, Las VegasFollow
N. Keller, University of Tennessee - KnoxvilleFollow
R. D. Miller, University of Tennessee - KnoxvilleFollow
Y. Azuma, Argonne Rational LaboratoryFollow
N. Berrah Mansour, Argonne National LaboratoryFollow
H. G. Berry, Argonne Rational Laboratory
Ivan A. Sellin, University of Tennessee - KnoxvilleFollow

Document Type

Article

Publication Date

8-1991

Publication Title

Physical Review Letters

Volume

67

Issue

8

First page number:

968

Last page number:

971

Abstract

We report the first measurement of the ratio of double-to-single photoionization of helium well above the double-ionization threshold. Using a time-of-flight technique, we find He⁺⁺/He⁺=1.6±0.3% at hν=2.8 keV. This value lies between calculations by Amusia (2.3%) and by Samson, who predicts 1.2% by analogy with electron-impact ionization cross sections of singly charged ions. Good agreement is obtained with older shake calculations of Byron and Joachain, and of Åberg, who predict 1.7%.

Keywords

Helium; Photoionization of gases; Synchrotron radiation

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., Lindle, D. W., Keller, N., Miller, R. D., Azuma, Y., Berrah Mansour, N., Berry, H. G., Sellin, I. A. (1991). Measurement of the Ratio of Double-to-Single Photoionization of Helium at 2.8 keV Using Synchrotron Radiation. Physical Review Letters, 67(8), 968-971.
https://digitalscholarship.unlv.edu/chem_fac_articles/75