TY - JOUR
T1 - H- photodetachment and radiative attachment for astrophysical applications
AU - McLaughlin, B. M.
AU - Stancil, P. C.
AU - Sadeghpour, H. R.
AU - Forrey, R. C.
N1 - Funding Information:
The work of BMMcL and RCF was supported by a research development grant from Pennsylvania State University, NSF Grant No. PHY-1503615 and a visiting research fellowship (BMMcL) from Queen's University Belfast. PCS acknowledges support from NSF Grant AST-0607733. PCS, BMMcL, and RCF would like to acknowledge support from the Institute for Theoretical Atomic, Molecular, and Optical Physics at the Harvard-Smithsonian Center for Astrophysics under the visitor's program which is supported by a grant from the National Science Foundation. The computational work was performed at the National Energy Research Scientific Computing Center in Oakland, CA, USA and at the National Institute for Computational Science (NICS) in Knoxville, TN, USA. The Kraken XT5 facility used at NICS was a resource of the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by NSF Grant No. OCI-1053575.
Publisher Copyright:
© 2017 IOP Publishing Ltd.
PY - 2017/5/15
Y1 - 2017/5/15
N2 - 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.
AB - 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.
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U2 - 10.1088/1361-6455/aa6c1f
DO - 10.1088/1361-6455/aa6c1f
M3 - Article
AN - SCOPUS:85019610031
SN - 0953-4075
VL - 50
JO - Journal of Physics B: Atomic, Molecular and Optical Physics
JF - Journal of Physics B: Atomic, Molecular and Optical Physics
IS - 11
M1 - 114001
ER -