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Title: H photodetachment and radiative attachment for astrophysical applications

Abstract

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.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE
OSTI Identifier:
1543922
Resource Type:
Journal Article
Journal Name:
Journal of Physics. B, Atomic, Molecular and Optical Physics
Additional Journal Information:
Journal Volume: 50; Journal Issue: 11; Journal ID: ISSN 0953-4075
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
Optics; Physics

Citation Formats

McLaughlin, B. M., Stancil, P. C., Sadeghpour, H. R., and Forrey, R. C. H − photodetachment and radiative attachment for astrophysical applications. United States: N. p., 2017. Web. doi:10.1088/1361-6455/aa6c1f.
McLaughlin, B. M., Stancil, P. C., Sadeghpour, H. R., & Forrey, R. C. H − photodetachment and radiative attachment for astrophysical applications. United States. doi:10.1088/1361-6455/aa6c1f.
McLaughlin, B. M., Stancil, P. C., Sadeghpour, H. R., and Forrey, R. C. Mon . "H − photodetachment and radiative attachment for astrophysical applications". United States. doi:10.1088/1361-6455/aa6c1f.
@article{osti_1543922,
title = {H − photodetachment and radiative attachment for astrophysical applications},
author = {McLaughlin, B. M. and Stancil, P. C. and Sadeghpour, H. R. and Forrey, R. C.},
abstractNote = {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.},
doi = {10.1088/1361-6455/aa6c1f},
journal = {Journal of Physics. B, Atomic, Molecular and Optical Physics},
issn = {0953-4075},
number = 11,
volume = 50,
place = {United States},
year = {2017},
month = {5}
}

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