Gas-phase formation of doubly-deuterated species

Details Gas-phase formation of doubly-deuterated species Gas-phase formation of doubly-deuterated species

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...364..780r&link_type=abstract

Astronomy and Astrophysics, v.364, p.780-784 (2000)

Astronomy and Astrophysics

Astrophysics

55

Ism: Abundances, Ism: Molecules, Ism: Clouds, Ism: Individual Objects: Li34N

Scientific paper

We present the first results from a time-dependent chemical model to include a gas-phase reaction scheme for producing doubly-deuterated species. Under normal conditions the formation of these species is inefficient. However, when the effects of the freeze out of gas phase species onto grains is included in the chemistry we find that the fractionation of both singly and doubly deuterated species is enhanced. We compare the predictions from our models with recent observations of deuterated molecules in L134N and find that, contrary to previous expectations, we can reproduce the observed levels of fractionation without recourse to an active grain-surface chemistry.

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