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Chemistry in cometary comaeSignificant 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.
Document ID
20040142175
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Irvine, W. M.
(Five College Radio Astronomy Observatory, University of Massachusetts Amherst 01003, United States)
Dickens, J. E.
Lovell, A. J.
Schloerb, F. P.
Senay, M.
Bergin, E. A.
Jewitt, D.
Matthews, H. E.
Date Acquired
August 22, 2013
Publication Date
January 1, 1998
Publication Information
Publication: Faraday discussions
Issue: 109
ISSN: 1359-6640
Subject Category
Lunar And Planetary Science And Exploration
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Exobiology

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