review detailed level dependent H2 rates in this paper
Non-thermal photons and H$_2$ formation in the early Universe (article)
Author
{Coppola}, C.~M. and {Galli}, D. and {Palla}, F. and {Longo}, S. and {Chluba}, J.
Journal
\mnras
Year
2013
Month
June
Keywords
molecular processes, early Universe
Abstract
The cosmological recombination of H and He at z ~= 103 and the formation
of H2 during the dark ages produce a non-thermal photon excess in the Wien
tail of the cosmic microwave background blackbody spectrum. Here, we
compute the effect of these photons on the H- photodetachment and
H_2^+ photodissociation processes. We discuss the implications for the
chemical evolution of the Universe in the post-recombination epoch,
emphasizing how important a detailed account of the full vibrational
manifold of H2 and H_2^+ in the chemical network is. We find that the
final abundances of H2, H_2^+, H_3^+ and HD are significantly smaller
than in previous calculations that neglected the effect of non-thermal
photons. The suppression is mainly caused by extra hydrogen
recombination photons and could affect the formation rate of first stars.
We provide simple analytical approximations for the relevant rate coefficients
and briefly discuss the additional effect of dark matter annihilation on
the considered reaction rates.
Adsnote
Provided by the SAO/NASA Astrophysics Data System
Adsurl
http://adsabs.harvard.edu/abs/2013MNRAS.tmp.1616C