Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9325230h&link_type=abstract
Far infrared spectra of amorphous and crystalline water ice and changes in these phases as the result of proton irradiation Univ
Astronomy and Astrophysics
Astronomy
1
Clathrates, Hydrates, Infrared Spectra, Phase Change Materials, Phase Transformations, Proton Irradiation, Absorption Spectra, Amorphous Materials, Crystals, Far Infrared Radiation, Ice, Water
Scientific paper
Far infrared spectra from 20 microns (500 cm-1) to 100 microns (100 cm-1) of water ice were measured. Amorphous ice deposited at 13 K has one absorption band at 45 microns (220 cm-1). Amorphous ice evolves into a crystalline form with absorptions at 44 microns (229 cm-1) and 62 microns (162 cm-1) as the temperature is increased to 155 K. Spectra documenting this phase change are presented as well as spectra of crystalline ice at temperatures between 13 K and 155 K. Far infrared spectra of amorphous and crystalline water ice before and after proton irradiation are also presented. Changes in these two forms are discussed in relation to ices in comets, grains, and planetary satellites in various radiation environments. Observations of non-terrestrial clathrate hydrates are still lacking despite the fact that clathrates first were suggested to exist in cometary and interstellar ices over forty years ago. Spectroscopy, the most direct method of astronomical detection, has been hampered by the similarity of clathrate hydrate spectra to those of unenclathrated guest molecules and solid H2O. A methanol (CH3OH) clathrate hydrate, using a recently published procedure, was prepared and its far-IR spectrum investigated. The spectrum is quite differenct from that of either unenclathrated CH3OH or solid H2O and so should be of value in astronomical searches for this clathrate.
Hudson Reggie L.
Moore Marla H.
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