Hydrogen-Deuterium Exchange in Photolyzed Methane-Water Ices

Details Hydrogen-Deuterium Exchange in Photolyzed Methane-Water Ices Hydrogen-Deuterium Exchange in Photolyzed Methane-Water Ices

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...703.1030w&link_type=abstract

The Astrophysical Journal, Volume 703, Issue 1, pp. 1030-1033 (2009).

Astronomy and Astrophysics

Astronomy

6

Astrochemistry, Ism: Molecules, Methods: Laboratory, Molecular Processes, Radiation Mechanisms: Non-Thermal

Scientific paper

Previous work has concluded that H-D exchange occurs readily in polycyclic aromatic hydrocarbons frozen in deuterated water (D2O) irradiated with ultraviolet light. Here, we examine H-D exchange in methane-water ices following exposure to ultraviolet radiation and analyze the products formed as a result. We find that H-D exchange also occurs in methane-water ices by means of ultraviolet photolysis. Exchange proceeds through a radical mechanism that implies that almost all organic species will undergo significant H-D exchange with the matrix in water ices exposed to ultraviolet radiation. Given sufficient energetic processing of the ice, the H/D ratio of an ice matrix may be transferred to the organic species in the ice.

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