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

Identifier

DOI: 10.1103/PhysRevLett.67.968

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