The Rate of the Reaction between CN and C 2H 2 at Interstellar Temperatures

Details The Rate of the Reaction between CN and C 2H 2 at Interstellar Temperatures The Rate of the Reaction between CN and C 2H 2 at Interstellar Temperatures

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...477..204w&link_type=abstract

Astrophysical Journal v.477, p.204

Astronomy and Astrophysics

Astronomy

22

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

Scientific paper

The rate coefficient for the important interstellar reaction between CN and C2H2 has been calculated as a function of temperature between 10 and 300 K. The potential surface for this reaction has been determined through ab initio quantum chemical techniques; the potential exhibits no barrier in the entrance channel but does show a small exit channel barrier, which lies below the energy of reactants. Phase-space calculations for the reaction dynamics, which take the exit channel barrier into account, show the same unusual temperature dependence as determined by experiment, in which the rate coefficient at first increases as the temperature is reduced below room temperature and then starts to decrease as the temperature drops below 50--100 K. The agreement between theory and experiment provides strong confirmation that the reaction occurs appreciably at cool interstellar temperatures.

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