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Charge Transfer and Some Cosmological Implications

Krstić has carried out the first quantum mechanical calculations near threshold for the charge transfer (CT) process H + H2(X 1Σ+g , ν = 0, J = 0) → H(1s) + H+2 . These results are relevant for models of primordial galaxy and first star formation that require reliable atomic and molecular data for obtaining the early universe hydrogen chemistry. 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 which 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