Associative Detachment Between H and H-: New Constraints on Molecular Hydrogen Formation in The Early Universe

Details Associative Detachment Between H and H-: New Constraints on Molecular Hydrogen Formation in The Early Universe Associative Detachment Between H and H-: New Constraints on Molecular Hydrogen Formation in The Early Universe

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mwac.meet..p08k&link_type=abstract

"Midwest Astrochemistry Meeting 2010, held 5-6 November at the University of Illinois at Urbana-Champaign. http://midwest.astroc

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Molecular hydrogen plays a central role in the cooling of primordial gas. The creation of molecular hydrogen in the early universe during the epoch of first star formation proceeds predominantly through the associative detachment (AD) reaction H- + H → H2- → H2 + e.
Despite being the most fundamental anion-neutral reaction in chemistry, no agreement has yet been reached between theory and experiment for this process. The uncertainty in the H2 creation rate severely limits our understanding of the formation of the first stars and protogalaxies. We have developed a new merged beams apparatus to measure the H2 AD rate coefficient as a function of the collision energy. We will present the experimental approach and show results of the first energy-resolved measurement of the H2 AD reaction which we use to derive an experimentally confirmed thermal rate coefficient. We will also show results of new cosmological models, demonstrating the implications of our measurements for the evolution of primordial gas in an initially ionized protogalactic halo.

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