Properties of amorphous H2O ice and origin of the 3.1-micron absorption

Details Properties of amorphous H2O ice and origin of the 3.1-micron absorption Properties of amorphous H2O ice and origin of the 3.1-micron absorption

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...117..164l&link_type=abstract

Astronomy and Astrophysics, vol. 117, no. 1, Jan. 1983, p. 164-169.

Astronomy and Astrophysics

Astrophysics

101

Ice, Infrared Absorption, Infrared Spectra, Interstellar Matter, Line Spectra, Molecular Clouds, Absorption Spectra, Amorphous Materials, Optical Properties, Particle Size Distribution, Stellar Evolution

Scientific paper

A study has been made of the optical constants of amorphous H2O ice in the 2.5-80 micron range. The range was selected for its relevance to astrophysics. The results are fit to a model of IR sources in molecular clouds. There is a good fit of the molecular cloud IR signature at 3.1-microns, assuming the grains are made of an intimate mixture of ice and silicate. A Mathis-like size distribution with a variable cut-off is assumed. A good fit is obtained for a 2/3 H2O, 1/3 NH3 spectral mixture with a large value of grain-size cut-off. This suggests that grains are much bigger in molecular clouds than in the low-density stellar medium.

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