Photodetachment cross sections of negative ions: The range of validity of the Wigner threshold law
- 1 December 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 40 (11), 6286-6292
- https://doi.org/10.1103/physreva.40.6286
Abstract
The threshold behavior of the photodetachment cross section of negative ions as a function of photon frequency is usually described by the Wigner law. However, there is little theoretical guidance about the range or accuracy of the Wigner law. This paper reports the results of a model calculation using the zero-core-contribution (ZCC) approximation. Theoretical expressions for the leading correction to the Wigner law are developed, giving the range of validity of the Wigner law and the expected accuracy. The results, derived within the ZCC approximation, are relevant to extraction of electron affinities from experimental photodetachment data.Keywords
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