The rate of the reaction between H and DCN

Details The rate of the reaction between H and DCN The rate of the reaction between H and DCN

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...338.1080h&link_type=abstract

Astronomy and Astrophysics, v.338, p.1080-1083 (1998)

Astronomy and Astrophysics

Astrophysics

5

Ism: Clouds, Ism: Abundances, Ism: Molecules, Molecular Processes

Scientific paper

It has been suggested that the slightly endothermic reaction between H and DCN to produce HCN and D serves to deplete DCN in hot core regions of giant molecular clouds. We have calculated the rate of this reaction for a range of temperatures up to 500 K with a combination of ab initio quantum chemical and dynamical techniques. We find that the reaction has two potential barriers lying between the reactants and products. These barriers permit only a very slow reaction except at high temperatures. We calculate that the rate coefficient k of the reaction follows the formula k (cm(3) s(-1) ) = 2 10(-11) Gamma_t exp (-4931/T), where Gamma_t is a tunneling correction. The estimated rate coefficient at 300 K is 5 10(-18) cm(3) s(-1) ; this rate coefficient is far too small to be important in the destruction of DCN.

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