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Astron. Astrophys. 357, 787-792 (2000)

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New experiments and interpretations concerning the "XCN" band in interstellar ice analogues

R.L. Hudson 1 and M.H. Moore 2

1 Departmen of Chemistry, Eckerd College, St. Petersburg, FL 33733, USA (hudsonrl@eckerd.edu)
2 Code 691, Astrochemistry Branch, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA (ummhm@lepvax.gsfc.nasa.gov)

Received 7 October 1999 / Accepted 12 January 2000


Evidence for the formation of [FORMULA] in interstellar ice analogues is summarized with an emphasis on the recent experiments of Demyk et al. (1998). Their experiments are reinterpreted in terms of two different types of chemical reactions, acid-base and oxidation-reduction. New spectra of UV-photolyzed and [FORMULA]-irradiated ices are presented, and reasons for similarities considered. The role of [FORMULA] and [FORMULA] scavengers in revealing ice photo- and radiation chemistries is stressed, and it is concluded that electron-transfer reactions may play a more important role than commonly thought.

Key words: infrared: ISM: lines and bands – ISM: molecules – ISM: abundances – molecular processes – ISM: dust, extinction

Send offprint requests to: R.L. Hudson (hudsonrl@eckerd.edu)

© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000