Resonance feature in Al{sup {minus}} photodetachment below the Al(3s{sup 2}4s{sup 2}S) threshold
- Department of Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)
- Department of Physics and Astronomy, The University of Nebraska, Lincoln, Nebraska 68588-0111 (United States)
Photodetachment of Al{sup {minus}}(3s{sup 2}3p{sup 23}P) near the threshold of the first excited state of neutral aluminum has been studied both experimentally and theoretically. A 19-keV mass-resolved Al{sup {minus}} beam was intersected by a frequency-doubled neodymium-doped yttrium aluminum garnet pumped dye-laser beam, and the fast atoms created by detachment processes were detected. Measurements just below the threshold of the first excited state, Al(3s{sup 2}4s{sup 2}S), find a large resonance peak in the detachment signal. An eigenchannel R-matrix calculation generates a resonance structure that is qualitatively similar to the data and identifies the large resonance peak as resulting from a doubly excited negative-ion state having predominantly (3s{sup 2}4s4p{sup 3}P{sup o}) character. Density plots of the resonance state are presented to demonstrate its structure. Near the Al(3s{sup 2}3p{sup 2}P) threshold, theory agrees also with recent relative measurements of D. Calabrese {ital et al.} [Phys. Rev. A {bold 54}, 2797 (1996)]. {copyright} {ital 1997} {ital The American Physical Society}
- DOE Contract Number:
- FG03-96ER14646
- OSTI ID:
- 531778
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 1 Vol. 56; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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