Status of laboratory experiments on ice mixtures and on the 12 micron H2O ice feature

Details Status of laboratory experiments on ice mixtures and on the 12 micron H2O ice feature Status of laboratory experiments on ice mixtures and on the 12 micron H2O ice feature

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122..105k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 105-110.

Astronomy and Astrophysics

Astronomy

29

Absorption Spectra, Cosmic Dust, Ice, Infrared Absorption, Interstellar Extinction, Interstellar Matter, Amorphous Materials, Infrared Astronomy, Molecular Absorption, Optical Properties, Water

Scientific paper

The optical constants of amorphous H2O ice measured between 2.5 and 15 μm wavelength are presented and dicussed. Depending on the degree of crystallinity of the ice, the peak absorption of the so-called 12 μm feature, calculated for small H2O ice particles, is located between 11.5 and 12.5 μm and its strength relative to that of the 3.1 μm band lies between 0.14 and 0.2. The results also support the hypothesis that the unidentified interstellar absorption at 6 μm may originate at least partly from H2O ice. Laboratory data obtained on mixtures of H2O ice with CO, CH4, C2H2, CH3OH, H2CO, and NH3 at 25K do not show that the 12 μm H2O ice feature can be suppressed or appreciably reduced if these compounds are added to the ice matrix. Since the interstellar 3.1 μm H2O ice feature seems to be only weakly distorted by admixed species, the authors suspect that the 12 μm H2O ice band is present in the interstellar spectra as well.

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