Enhanced Deuterium Fractionation in Dense Interstellar Cores Resulting from Multiply Deuterated H+3

Details Enhanced Deuterium Fractionation in Dense Interstellar Cores Resulting from Multiply Deuterated H+3 Enhanced Deuterium Fractionation in Dense Interstellar Cores Resulting from Multiply Deuterated H+3

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...591l..41r&link_type=abstract

The Astrophysical Journal, Volume 591, Issue 1, pp. L41-L44.

Astronomy and Astrophysics

Astronomy

109

Ism: Clouds, Ism: Individual: Alphanumeric: L1544, Ism: Molecules, Molecular Processes

Scientific paper

In this Letter, we present the first results from updated models of interstellar deuterium chemistry that now include all possible deuterated isotopomers of H+3. We find that in regions of high density and heavy depletion, such as prestellar cores, the inclusion of HD+2 and D+3 enhances the fractionation of ionic and neutral species significantly. Our models are the first to predict the very high atomic D/H ratios (>=0.3) necessary for grain-surface chemistry models to reproduce the high formaldehyde and methanol fractionation seen in star-forming regions.

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