The role of H2D+ in the deuteration of interstellar molecules

TJ Millar, Helen Roberts, A.J. Markwick, S.B. Charnley

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Collisions between H-3(+) and HD in molecular clouds lead to the fractionation of deuterium in H2D+ at temperatures below 20 K. In this article, we describe the chemistry of H2D+ and discuss how variations in temperature and elemental abundances affect the level of fractionation in H2D+ and other species. We describe how accretion of gas-phase molecules on to cold dust grains enhances the deuteration in several molecules including doubly deuterated molecules. Mie show that the ion-neutral drift velocities attained in slow Alfven waves can destroy H2D+ in non-thermal reactions. As a result, the degree of fractionation can be reduced and we discuss observational consequences of such a model for the dark dust cloud TMC-1.
Original languageEnglish
Pages (from-to)2535-2547
Number of pages13
JournalPHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume358
Issue number1774
Publication statusPublished - Feb 2000

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'The role of H2D+ in the deuteration of interstellar molecules'. Together they form a unique fingerprint.

  • Cite this