Deuterium enrichment in interstellar HCN and HNC

Details Deuterium enrichment in interstellar HCN and HNC Deuterium enrichment in interstellar HCN and HNC

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.270...39b&link_type=abstract

Nature, vol. 270, Nov. 3, 1977, p. 39-41.

Computer Science

19

Abundance, Deuterium Compounds, Hydrocyanic Acid, Interstellar Chemistry, Interstellar Matter, Molecular Gases, Cosmic Rays, Hydrogen Compounds, Ion Recombination, Ionizing Radiation, Isotope Effect, Optical Density

Scientific paper

The paper is concerned with deuterium enrichment in interstellar HCN and HNC which occur in dense molecular clouds where the visual/ultraviolet optical depth is very high and ionization is predominantly by cosmic rays. Since column densities of HNC comparable to those of HCN have been observed in dark clouds, it is thought that equilibrium between the two species is not established, so that the explanation of molecular deuterium enrichments in interstellar HCN and HNC must lie in isotope effects that influence the formation processes rather than equilibria involving HCN or HNC. Pathways for the formation and deuteration of these molecules are proposed. The role of deuterated ammonia is considered, and speculation is offered as to the identity of the major isotope-effect reactions.

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