Journal
ASTROPHYSICAL JOURNAL
Volume 622, Issue 1, Pages L73-L75Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/429370
Keywords
atomic data; atomic processes; ISM : atoms; ISM : clouds; plasmas
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We calculate the He I case B recombination cascade spectrum using improved radiative and collisional data. We present new emissivities over a range of electron temperatures and densities. The differences between our results and the current standard are large enough to have a significant effect not only on the interpretation of observed spectra of a wide variety of objects, but also on determinations of the primordial helium abundance.
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