Daniel Wolf Savin et al 2004 ApJ 606 L167 doi:10.1086/421108
Rate Coefficient for H+ + H2(X1Σg+, ν = 0, J = 0) → H(1s) + H2+ Charge Transfer and Some Cosmological Implications
FREEDaniel Wolf Savin1, Predrag S. Krstić2, Zoltán Haiman3 and Phillip C. Stancil4
Show affiliationsKrstić has carried out the first quantum mechanical calculations near threshold for the charge transfer (CT) process H+ + H2(X 1Σ
, ν = 0, J = 0) → H(1s) + H
. These results are relevant for models of primordial galaxy and first star formation that require reliable atomic and molecular data for obtaining the hydrogen chemistry of the early universe. Using the results of Krstić, we calculate the relevant CT rate coefficient for temperatures between 100 and 30,000 K. We also present a simple fit that can be readily implemented into early universe chemical models. Additionally, we explore how the range of previously published data for this reaction translates into uncertainties in the predicted gas temperature and H2 relative abundance in a collapsing primordial gas cloud. Our new data significantly reduce these cosmological uncertainties that are due to the uncertainties in the previously published CT rate coefficients.
- Subject headings
atomic data; early universe; galaxies: formation; molecular data; molecular processes; stars: formation
- Dates
-
Issue 2 (2004 May 10)
Received 2004 February 5, accepted for publication 2004 March 17
Published 2004 April 8
An Erratum for this article has been published in 2004 ApJ 607 L147
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Rate Coefficient for H+ + H2(X1Σg+, ν = 0, J = 0) → H(1s) + H2+ Charge Transfer and Some Cosmological Implications
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