Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...528a.129g&link_type=abstract
Astronomy & Astrophysics, Volume 528, id.A129
Astronomy and Astrophysics
Astrophysics
Molecular Processes, Ism: Molecules, Astrochemistry
Scientific paper
Gas phase chemistry in the cold interstellar clouds is dominated by ion-molecule and radical-radical interactions, though some neutral-neutral reactions are also barrier-free and efficient at cold temperatures. It has been suggested that it is impossible to synthesize detectable abundances of the pre-biotic HCN oligomer adenine (H5C5N5) in the interstellar medium via successive neutral-neutral reactions. We attempted therefore to use quantum chemical techniques to explore if adenine can possibly form in the interstellar space by radical-radical and radical-molecule interaction schemes, both in the gas phase and in the grains. We report results of ab initio calculations for the formation of adenine starting from some of the simple neutral molecules and radicals detected in the interstellar space. The reaction path is found to be totally exothermic and barrier free, which increases the probability of occurrence in the cold interstellar clouds (10 - 50 K). We also estimated the reaction rates.
Gupta Ved Prakash
Narain Singh Rishi
Rawat P.
Singh Amit
Tandon Puneet
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