Deuterium fractionation in the reactions of D + H2CO and H + D2CO at 15 K

Details Deuterium fractionation in the reactions of D + H2CO and H + D2CO at 15 K Deuterium fractionation in the reactions of D + H2CO and H + D2CO at 15 K

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..855..107h&link_type=abstract

ASTROCHEMISTRY: From Laboratory Studies to Astronomical Observations. AIP Conference Proceedings, Volume 855, pp. 107-112 (2006

Biology

2

Chemical Reactions, Energy Disposal, And Angular Distribution, As Studied By Atomic And Molecular Beams, Astrobiology And Astrochemistry Of The Solar System And Interplanetary Space, Atomic, Molecular, And Chemical, And Grain Processes, Molecular Clouds, H2 Clouds, Dense Clouds, And Dark Clouds

Scientific paper

The reaction of cold H and D atoms with solid formaldehyde (D2CO and H2CO) deposited on amorphous H2O ice at 15 K was studied experimentally by in-situ FTIR spectroscopy. New routes of formation of deuterated formaldehyde (HDCO and D2CO) were identified. In the reaction of D atoms with H2CO, H-D substitution was observed, H2CO --> HDCO --> D2CO, and for the reaction of H atoms with D2CO, the analogous D-H substitution was observed, D2CO --> HDCO --> H2CO. In the reaction of D atoms with H2CO, the rate of H-D substitution was greater than that of formation of deuterated methanol-d2-4 by addition of 2D atoms to formaldehyde-d0-2. However, in the reaction of H atoms with D2CO, the rate of D-H substitution was comparable to that of addition of 2H atoms to D2CO.

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