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Deuterated Species in Star-Forming Regions

Lis, D. C. and Gerin, M. and Roueff, E. and Phillips, T. G. (2004) Deuterated Species in Star-Forming Regions. In: The Dense Interstellar Medium in Galaxies. Springer Proceedings in Physics. No.91. Springer , Berlin, pp. 487-490. ISBN 978-3-642-62348-6.

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A number of multiply deuterated molecular species have been recently detected in the ISM [1]–[6] with abundances far exceeding earlier theoretical expectations. Detailed formation mechanisms for these species have not yet been satisfactorily established, but recent computations of Roberts et al. [7] show that the inclusion of HD+2 and D+3 in the gas-phase chemical network significantly enhances the fractionation of ionic and neutral species in regions of high density and heavy depletion. These models also predict the very high atomic D/H ratios necessary for grain-surface chemistry to reproduce the high formaldehyde and methanol fractionation seen in star forming regions. We argue that slow C-type shocks associated with molecular outflows may produce conditions favorable for deuterium fractionation reactions in star forming regions by (i) increasing the gas volume density and thus shortening the depletion and gas-phase reaction time-scales or (ii) evap orating grain mantle ices. In the case of triply deuterated ammonia, an extensive observational search carried out at the CSO has resulted in five detections, including only two strong detections (Barnard 1 [3] and L1689N [8]). As discussed below, in both these regions there are indications of shock interactions between molecular outflows and the ambient gas.

Item Type:Book Section
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URLURL TypeDescription ReadCube access ItemJournal Article
Lis, D. C.0000-0002-0500-4700
Roueff, E.0000-0002-4949-8562
Additional Information:© 1997 Springer-Verlag Berlin Heidelberg. Originally published by Springer-Verlag Berlin Heidelberg New York in 1997.
Series Name:Springer Proceedings in Physics
Issue or Number:91
Record Number:CaltechAUTHORS:20171127-153159871
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83467
Deposited By: Tony Diaz
Deposited On:27 Nov 2017 23:45
Last Modified:15 Nov 2021 19:58

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