Prediction of deuterium abundance in comets

Details Prediction of deuterium abundance in comets Prediction of deuterium abundance in comets

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984baicz..35..361v&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 35, no. 6, 1984, p. 361-364.

Other

Abundance, Comet Nuclei, Deuterium, Interstellar Chemistry, Chemical Evolution, Chemical Reactions, Molecular Clouds, Solar System

Scientific paper

Using a chemical scheme based on ion-molecule reactions in cool interstellar clouds, the deuterium enrichment of volatile material in comets is discussed. It is assumed that the hydrogen-containing molecules are deuterated before accretion and condensation on the core-mantle dust particles from which the cometesimals are formed. The estimated total ratio in a cometary nucleus is D/H = about 0.0002. The possibility of isotope fractionation in comets means, however, that these objects are not suitable for primordial deuterium tests. On the other hand, deuterium abundance might be a sensitive indicator of the physical properties of the environment where comets are formed.

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