New experiments and interpretations concerning the ``XCN'' band in interstellar ice analogues
Abstract
Evidence for the formation of OCN^- in interstellar ice analogues is summarized with an emphasis on the recent experiments of Demyk et al. (\cite{demyk98}). Their experiments are reinterpreted in terms of two different types of chemical reactions, acid-base and oxidation-reduction. New spectra of UV-photolyzed and p^+-irradiated ices are presented, and reasons for similarities considered. The role of e^- and H^+ 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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 2000
- Bibcode:
- 2000A&A...357..787H
- Keywords:
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- INFRARED: ISM: LINES AND BANDS;
- ISM: MOLECULES;
- ISM: ABUNDANCES;
- MOLECULAR PROCESSES;
- ISM: DUST;
- EXTINCTION