Irvine W M, Dickens J E, Lovell A J, Schloerb F P, Senay M, Bergin E A, Jewitt D, Matthews H E
Five College Radio Astronomy Observatory, University of Massachusetts, Amherst 01003, USA.
Faraday Discuss. 1998(109):475-92. doi: 10.1039/a709289j.
Significant gas-phase chemistry occurs in the comae of bright comets, as is demonstrated here for the case of Comet Hale-Bopp. The abundance ratio of the two isomers, hydrogen cyanide and hydrogen isocyanide, is shown to vary with heliocentric distance in a way that is consistent with production of HNC by ion-molecule chemistry initiated by the photoionization of water. Likewise, the first maps of emission from HCO+ show an abundance and an extended distribution that are consistent with the same chemical model.
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