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2003 June 20

Volume 590, Number 2
The Astrophysical Journal, 590:874–881, 2003 June 20
© 2003. The American Astronomical Society. All rights reserved. Printed in U.S.A.
DOI: 10.1086/375149

Photodestruction of Relevant Interstellar Molecules in Ice Mixtures

Hervé Cottin

Laboratoire Interuniversitaire des Systèmes Atmosphériques, Universités Paris VII-Paris XII, Créteil, France; cottin@lisa.univ-paris12.fr

Marla H. Moore

Astrochemistry Branch, Code 691, NASA Goddard Space Flight Center, Greenbelt, MD 20771; marla.h.moore@nasa.gov

and

Yves Bénilan

Laboratoire Interuniversitaire des Systèmes Atmosphériques, Universités Paris VII-Paris XII, Créteil, France; benilan@lisa.univ-paris12.fr

ABSTRACT

UV photodestruction of some interstellar molecules is studied in different kinds of ices. CH4, CH3OH, NH3, CO2, CO, and HNCO are photolyzed as pure ices, or mixed with water or molecular nitrogen, at about 10 K. The destruction cross sections of these molecules are estimated for use in photochemical models of interstellar ices. We show that the destruction rate depends on the ice in which the studied compound is embedded.

Received 2002 December 23; accepted 2003 March 3

Subject Headings:

astrochemistry—ISM: molecules—methods: laboratory—molecular processes—ultraviolet: ISM

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