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Molecular Hydrogen Formation in the Early Universe: New Implications From Laboratory Measurements

Savin, Daniel Wolf; Miller, Kenneth; Kreckel, H.; Bruhns, H.; Urbain, X.; Glover, S. C. O.; Cizek, M.

We have performed the first energy-resolved measurement of the associative detachment (AD) reaction H- + H → H2 + e-: This reaction is the dominant formation pathway for H2 during the epoch of first star formation in the early universe. Despite being the most fundamental anion-neutral chemical reaction, experiment and theory have failed to converge in both magnitude and energy dependence. The uncertainty in this rate coefficient severely limits our under- standing of the formation of the first stars and protogalaxies.

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Academic Units
Astronomy and Astrophysics
Publisher
NASA
Published Here
April 5, 2013