New H- Photodetachment and Radiative Attachment Computations for Astrophysical Environments

Details New H- Photodetachment and Radiative Attachment Computations for Astrophysical Environments New H- Photodetachment and Radiative Attachment Computations for Astrophysical Environments

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21831805s&link_type=abstract

American Astronomical Society, AAS Meeting #218, #318.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astrophysics

Scientific paper

We combine new accurate calculations, asymptotic relations, and available experimental data to construct an H- photodetachment cross section reliable for a large range of photon energies. In particular, account is taken of the series of auto-detaching shape and Feshbach resonances between 11.97 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 resonances and double 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 due to distortion photons in the recombination era. Implications of the new rate coefficients and photo-rates are discussed for a variety astrophysical environments.
The work of BMMcL and RCF was supported by a research development grant from Pennsylvania State University. PCS acknowledges support from NSF Grant AST-0607733, while AD acknowledges NSF Grant AST-0607532.

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