Laboratory IR Studies of Ion-Irradiated Ices Containing H_2O, CO_2 and NH_3

Details Laboratory IR Studies of Ion-Irradiated Ices Containing H_2O, CO_2 and NH_3 Laboratory IR Studies of Ion-Irradiated Ices Containing H_2O, CO_2 and NH_3

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30.1102m&link_type=abstract

American Astronomical Society, DPS meeting #30, #46.P05; Bulletin of the American Astronomical Society, Vol. 30, p.1102

Astronomy and Astrophysics

Astronomy

Scientific paper

Acid-base reactions in irradiated ices containing molecules such as H_2O, CO_2, and NH_3 are one scheme we are examining for the formation of species whose spectra could match the unidentified 6.8 micron interstellar ice feature in NGC 7548 IRS9 and RAFGL 7009S. Similar reactions could be important on the icy surfaces of some satellites. We have examined the reaction of NH_3 with a layer of carbonic acid, H_2CO_3, and identified the formation of carbamic acid. In this experiment, a layer of NH_3 is condensed at 18K and covered with a layer of H_2O + CO_2 ice. During irradiation, H_2CO_3 is formed in the H_2O + CO_2 ice layer (JGR 96, E2, 17,541, 1991). During slow warming the NH_3 diffuses through and reacts with the carbonic acid. The spectrum evolves into a stable set of features near 250 K. The features are identified as carbamic acid, NH_3COO (Spectrochimica Acta, accepted, 1998). The spectrum of carbamic acid is a good match with the 6.8 micron band, but since carbamic acid also contains a strong 7.7 micron band, it is not a good candidate for the interstellar feature. Additional ice experiments in which NH_3 is intimately mixed with H_2O and CO_2 result in a weaker 7.7 micron component. In progress are studies where similar reactions are done on a magnesium silicate surface.

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