Alternative routes to deuteration in dark clouds

Details Alternative routes to deuteration in dark clouds Alternative routes to deuteration in dark clouds

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..868h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 4, p. 868-880.

Other

19

Dark Matter, Deuterium Compounds, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Cyano Compounds, Hydrocarbons, Molecular Interactions, Temperature Dependence

Scientific paper

Novel approaches to the deuteration of C3H2, HC3, and HC5N in dark clouds are investigated on the assumption that protonated HC3N might form different isomers, a linear stucture (HC3NH(+)) being the most stable. The effect of linear HC3NH(+) and HC3NH(+) on the formation of HC3N and HC5N is considered, and it is found that deuteration ratios at about 10 K are reduced, in the case of HC3N, to values significantly below those observed, such that a deuteration mechanism other than direct deuteron transfer is probably required for cold clouds. However, C3H2 has the highest observed deuteration ratio in cold clouds (greater than about 10 percent), several times larger than can be accounted for in existing models. Various potential solutions to this discrepancy are tested, the most promising possibility being that the presumed precursor ion C3H3(+) is directly deuterated by reaction with HD molecules. Deuteration ratios for both C3H2 and HC3N which are close to those observed are predicted.

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