Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..103...45m&link_type=abstract
Astronomy and Astrophysics Suppl. 103, 45-56 (1994)
Astronomy and Astrophysics
Astrophysics
18
Scientific paper
We have measured the far-infrared spectra of pure H_2_O, CH_3_OH, NH_3_, CO_2_, H_2_CO, CH_4_, and CO ices and H_2_O-dominated binary mixtures of CH_3_OH, NH_3_, CO_2_, H_2_ CO, CH_4_, and CO from 500cm^-1^ (20μm) to 100cm^-1^ (100μm) at low temperatures. We also examined spectra of several more complex ices. These results represent a consistent set of data on astrophysically relevant molecules and mixtures over a wide range of temperatures. This set provides information in a spectral region that will be increasingly accessible with the advent of future orbiting observatories. Spectra of both the amorphous and crystalline phases of each of the pure molecular ices are unique. Spectra of icy mixtures, however, are in general dominated by H_2_O ice features over the entire range of temperatures studied. One exception to this is the H_2_O+CH_3_ OH ice which evolves from an amorphous deposit to form a multi-line crystalline-like spectrum we have identified with the recently reported CH_3_OH clathrate hydrate. Implications of these results on the identification of extraterrestrial ices based on observations in the far-infrared are included.
Hudson Reggie L.
Moore Marla H.
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