o-H_2, p-H_2 and HD vibrational kinetics in the Early Universe

Details o-H_2, p-H_2 and HD vibrational kinetics in the Early Universe o-H_2, p-H_2 and HD vibrational kinetics in the Early Universe

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.240l&link_type=abstract

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

Astronomy and Astrophysics

Astronomy

Scientific paper

We investigate the vibrational kinetics of o-H2, p-H2 and HD under conditions of interest for Early Universe chemistry. We write a Master Equation for the relative population of vibrational levels assuming that chemical nonequilibrium is driven by the vibro-rotational selectivity of the reactions producing H2 and HD. We further assume that the main mechanism leading to vibro-rotational redistribution is molecule-radiation interaction. The results show that the vibrational level populations of these species are not in local thermal equilibrium for a wide range of redshifts. We discuss in particular the temperature associated to different transitions and to the o- and p- manifolds and the impact of the vibrational nonequilibrium of HD on its cooling function.

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