Near-threshold infrared photodetachment of: A determination of the electron affinity of aluminum and the range of validity of the Wigner law
- 1 October 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 54 (4), 2797-2804
- https://doi.org/10.1103/physreva.54.2797
Abstract
The relative photodetachment cross section of has been measured in the wavelength range 2420–2820 nm (0.440–0.512 eV), using a coaxial ion-laser beams apparatus, in which a 2.98-keV beam is merged with a beam from an F-center laser. The cross-section data near the photodetachment threshold have been fitted to the Wigner threshold law and to the zero-core-contribution theory of photodetachment. The electron affinity of aluminum was determined to be 0.44094(+0.00066/-0.00048) eV, after correcting the experimental threshold for unresolved fine structure in the ground states of and Al. The new measurement is in agreement with the best previous measurement (0.441±0.010 eV) and is 20 times more precise. The Wigner law agrees with experiment within a few percent for photon energies within 3% of threshold. A proposed leading correction to the Wigner law is discussed. © 1996 The American Physical Society.
Keywords
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