The HNC/HCN ratio in comets
Publication Date
1997
Journal or Book Title
EARTH MOON AND PLANETS
Abstract
The abundance ratio of the isomers HCN and HNC has been investigated in comet Hale-Bopp (C/1995 O1) through observations of the J = 4−3 rotational transitions of both species for heliocentric distances 0.93 < r < 3 AU, both pre- and post-perihelion. After correcting for the optical depth of the stronger HCN line, we find that the column density ratio of HNC/HCN in our telescope beam increases significantly as the comet approaches the Sun. We compare this behavior to that predicted from an ion-molecule chemical model and conclude that the HNC is produced insignificant measure by chemical processes in the coma; i.e., for comet Hale-Bopp, HNC is not a parent molecule sublimating from the nucleus.
DOI
https://doi.org/10.1023/A:1006202823878
Pages
29-35
Volume
78
Issue
1-3
Recommended Citation
Irvine, William M.; Dickens, JE; Lovell, AJ; Schloerb, FP; Senay, M; Bergin, EA; Jewitt, D; and Matthews, HE, "The HNC/HCN ratio in comets" (1997). EARTH MOON AND PLANETS. 199.
https://doi.org/10.1023/A:1006202823878
Comments
The published version is located at http://www.springerlink.com/content/u467634mxwkl8245/