H- photodetachment and radiative attachment for astrophysical applications

McLaughlin, B. M.; Stancil, P. C.; Sadeghpour, H. R.; Forrey, R. C.

doi:10.1088/1361-6455/aa6c1f

H^- photodetachment and radiative attachment for astrophysical applications

Journal Article · Mon May 15 04:00:00 EDT 2017 · Journal of Physics. B, Atomic, Molecular and Optical Physics

DOI:https://doi.org/10.1088/1361-6455/aa6c1f· OSTI ID:1543922

McLaughlin, B. M.; Stancil, P. C.; Sadeghpour, H. R.; Forrey, R. C.

We combine R-matrix calculations, asymptotic relations, and comparison to available experimental data to construct an H- photodetachment cross section reliable over a large range of photon energies and take into account the series of auto-detaching shape and Feshbach resonances between 10.92 and 14.35 eV. The accuracy of the cross section is controlled by ensuring that it satisfies all known oscillator strength sum rules, including contributions from the resonances and single-photon double-electron photodetachment. From the resulting recommended cross section, spontaneous and stimulated radiative attachment rate coefficients are obtained. Photodetachment rates are also computed for the standard interstellar radiation field, in diffuse and dense interstellar clouds, for blackbody radiation, and for high redshift distortion photons in the recombination epoch. Implications are investigated for these astrophysical radiation fields and epochs.

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE

OSTI ID:: 1543922

Journal Information:: Journal of Physics. B, Atomic, Molecular and Optical Physics, Journal Name: Journal of Physics. B, Atomic, Molecular and Optical Physics Journal Issue: 11 Vol. 50; ISSN 0953-4075

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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