Low-energy photodetachment of O{sup -}
- Department of Physics and Astronomy, Drake University, Des Moines, Iowa 50311 (United States)
The B-spline R-matrix method is used to investigate the low-energy photodetachment of O{sup -}(2p{sup 5}) for photon energies from threshold to 7 eV. We report a detailed study regarding the dependence of the predicted partial and total photodetachment cross sections on the scattering model and the accuracy of the target description. A multiconfiguration Hartree-Fock method with nonorthogonal term-dependent orbitals is employed to generate accurate representations of the target wave functions. Four close-coupling scattering models with a different number of target states in the expansion are used to explore the dependence of the calculated photodetachment cross sections on the polarization of the target. Our largest model for the e-O collision problem in the final state includes 60 states, namely 25 bound and autoionizing states of neutral oxygen derived from the 1s{sup 2}2s{sup 2}2p{sup 4}, 2s{sup 2}2p{sup 3}nl, and 2s2p{sup 5} configurations, plus a set of pseudostates to partially account for the polarizability of the ground state 2p{sup 4} {sup 3}P and the metastable 2p{sup 4} {sup 1}D and {sup 1}S states. We only find a small dependence of the calculated photodetachment cross section on the amount of target polarization accounted for, but a very strong dependence of the near-threshold results on the degree of short-range inner-core correlation incorporated in the target description.
- OSTI ID:
- 20974585
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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