On the relative abundance of LiH and LiH+ molecules in the early universe: new results from quantum reactions

Details On the relative abundance of LiH and LiH+ molecules in the early universe: new results from quantum reactions On the relative abundance of LiH and LiH+ molecules in the early universe: new results from quantum reactions

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.102b&link_type=abstract

The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole

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The chemistry of Li in the early universe has been discussed in the past, reaching contrasting conclusions (see e.g., SLD96; BG97; GP98; Vonlanthen et al. 2009). Of critical relevance, is the uncertainty in the knowledge of reliable reaction rates for the destruction of LiH and LiH^+ molecules formed by radiative recombination (Dickinson & Gadéa 2000) via strongly exothermic reactions without entrance barriers:
LiH + H → Li + H_2
LiH + H^+ → Li + H_2^+
and
LiH^+ + H → Li^+ + H_2.
Therefore, it is an accurate knowledge of the reaction rates for the above processes, at low redshift values, that can ultimately tell us what the end-role of the LiH/LiH^+ systems could be as efficient coolants under early universe conditions. The task of the present work is to show that the reaction rates recently determined from fully ab-initio quantum methods (Bovino et al. 2009, 2010a, 2010b), which also employ accurate interaction forces between partners, have a significant impact on the evolution of LiH and LiH^+ during the post-recombination era of the early universe. We shall further show that a more realistic description of the rates for a neutralization process
LiH^+ + e^- → Li + H
could substantially change the relative abundance of the ionic molecular species.

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