Photodetachment of the 1s2s2p{sup 4}P state of He{sup {minus}} from threshold to 100 eV
- Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303 (United States)
Calculations of cross sections and photoelectron angular distributions from the photodetachment of the 1s2s2p{sup 4}P metastable state of He{sup {minus}} have been performed from threshold to 100 eV using multiconfiguration Hartree-Fock wave functions for discrete states and coupling continuum channels with closed channels to include resonances. Ejection of each electron was considered and ejection plus excitation was included in connection with 1s photoabsorption. The 1s2p{sup 2} and 2s2p{sup 2}{sup 4}P resonances were found in good agreement with recent experiments and calculations; the reason that the former lies above the 2s threshold while the latter lies below the 1s threshold is discussed. The nonresonant 2p cross section is in excellent agreement with experiments and other calculations. The 2s results, in which Cooper minima are predicted, are not in agreement with a similar calculation, particularly for the {beta} parameter. The 1s cross section shows a large maximum just above threshold, much larger than the 1s cross section in neutral He, and at somewhat higher energy the cross section is dominated by 1s detachment plus excitation to the (2s3p{plus_minus}3s2p){sup 3}P and 3s3p{sup 3}P autoionizing states of He. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 435202
- Journal Information:
- Physical Review A, Vol. 55, Issue 1; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
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