Abstract
In this Letter, we present the first results from updated models of interstellar deuterium chemistry that now include all possible deuterated isotopomers of H. We find that in regions of high density and heavy depletion, such as prestellar cores, the inclusion of HD and D 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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