Solid CO2 in laboratory and in dense molecular clouds

Details Solid CO2 in laboratory and in dense molecular clouds Solid CO2 in laboratory and in dense molecular clouds

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..735p&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 735

Astronomy and Astrophysics

Astrophysics

Carbon Dioxide, Laboratory, Infrared Spectroscopy, Ices

Scientific paper

We have studied by laboratory infrared spectroscopy the profile of the band due to the CO2 bending mode in different H2O:CH3OH:CO2 mixtures. Icy mixtures have been accreted on a substrate at 12.5 K inclined of 45 degrees with respect to the infrared beam of the spectrometer. Spectra have been taken with the electric vector of the infrared beam parallel (P polarized) and perpendicular (S polarized) to the plane of incidence. The samples have been warmed up and spectra have been taken at different temperatures. We have found that the profile of the band due to the CO2 bending mode strongly depends on the temperature. Furthermore for the mixtures studied, the profile of this band is different in the two different polarization cases. In particular features not due to absorption appear in the P polarization case. Here we discuss the implications of these results in the astrophysical context.

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