Atmospheric deuterium fractionation: HCHO and HCDO yields in the CH2DO + O2 reaction
Item
Title (Dublin Core)
Atmospheric deuterium fractionation: HCHO and HCDO yields in the CH2DO + O2 reaction
Description (Dublin Core)
The formation of formaldehyde via hydrogen atom transfer from the methoxy radical to molecular oxygen is a key step in the atmospheric photochemical oxidation of methane, and in the propagation of deuterium from methane to molecular hydrogen. We report the results of the first investigation of the branching ratio for HCHO and HCDO formation in the CH<sub>2</sub>DO + O<sub>2</sub> reaction. Labeled methoxy radicals (CH<sub>2</sub>DO) were generated in a photochemical reactor by photolysis of CH<sub>2</sub>DONO. HCHO and HCDO concentrations were measured using FTIR spectroscopy. Significant deuterium enrichment was seen in the formaldehyde product, from which we derive a branching ratio of 88.2±1.1% for HCDO and 11.8±1.1% for HCHO. The implications of this fractionation on the propagation of deuterium in the atmosphere are discussed.
Creator (Dublin Core)
Nilsson, E. J. K.
Johnson, M. S.
Taketani, F.
Matsumi, Y.
Hurley, M. D.
Wallington, T. J.
Date (Dublin Core)
2018-01-15
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-7-5873-2007
https://acp.copernicus.org/articles/7/5873/2007/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
