Title Hydrogen-deuterium exchange in photolyzed methane-water ices
Author Weber, A.S.; Hodyss, R.; Johnson, P.V.; Willacy, K.; Kanik, I.
Author Affil Weber, A.S., California Institute of Technology, Jet Propulsion Laboratory, Pasadena, CA
Source The Astrophysical Journal, 703(1), p.1030-1033, . Publisher: University of Chicago Press for the American Astronomical Society, Chicago, IL, United States. ISSN: 0004-637X
Publication Date Sept. 20, 2009
Notes In English. 26 refs. GeoRef Acc. No: 310092
Index Terms hydrocarbons; hydrogen; ice; isotopes; ultraviolet radiation; water; aliphatic hydrocarbons; alkanes; cosmochemistry; deuterium; electromagnetic radiation; methane; molecular dynamics; organic compounds; photochemistry; photolysis; stable isotopes
Abstract 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. Copyright (Copyright) 2009. The American Astronomical Society. All rights reserved.
URL http://hdl.handle.net/10.1088/0004-637X/703/1/1030
Publication Type journal article
Record ID 65006761