Photodetachment of H{sup {minus}} and Li{sup {minus}}
- Department of Atomic Physics, Stockholm University, S-104 05 Stockholm (Sweden)
The photodetachment cross sections for H{sup {minus}} and Li{sup {minus}} in the vicinity of the H({ital n}=2{minus}4) and Li({ital n}=3{minus}4) thresholds are calculated. A discrete numerical basis set, combined with the method of complex rotation, is used to construct highly correlated descriptions of both initial and final states. The energies and widths of the doubly excited states are calculated directly and compared with results from experiments and other calculations when available. Other resonance parameters for photoexcitation from the ground state to the autodetaching states, describing the shape and the strength of the resonances, are also calculated. Mass polarization was considered for the doubly excited states of H{sup {minus}}, but was found to be much smaller than the present experimental accuracy. The possibility of describing a photodetachment resonance with a Fano profile, i.e., with a few resonance parameters connected to properties of a specific autodetaching state, is investigated and it is concluded that most resonances in Li{sup {minus}} in the region studied, where overlapping resonances are common, cannot be meaningfully analyzed in this way.
- OSTI ID:
- 118446
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 4 Vol. 52; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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