Laboratory Studies of Solid Carbon Dioxide in Planetary and Interstellar Ices

Details Laboratory Studies of Solid Carbon Dioxide in Planetary and Interstellar Ices Laboratory Studies of Solid Carbon Dioxide in Planetary and Interstellar Ices

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21923801w&link_type=abstract

American Astronomical Society, AAS Meeting #219, #238.01

Astronomy and Astrophysics

Astronomy

Scientific paper

Laboratory spectra have shown that CO2 is a powerful diagnostic tool for analyzing infrared data from remote observations, as it has been detected on icy moons in the outer solar system as well as dust grain surfaces in the interstellar medium. IR absorption profiles of CO2 within ice mixtures containing H2O and CH3OH change with respect to temperature and mixture ratios. In this particular study, the CO2 stretch mode around 2350cm-1 (4.3 microns) is systematically observed in different mixtures with H2O and CH3OH in temperature ranges from 15 K to 150 K, as well as vibrational modes in the near-IR such as the combination bands near 3700 cm-1 (2.7 microns) and 5080 cm-1 (2.0 microns). Additionally, some high-temperature deposits (T > 50 K) of H2O, CH3OH, and CO2 ice mixtures were performed to determine the maximum temperatures at which CO2 will deposit on the sample window. These data may then be used to interpret spectra obtained from remote IR observations. This research was sponsored by Oak Ridge Associated Universities (ORAU) through the NASA Postdoctoral Program (NPP) as well as Ames Research Center and the SETI institute who provided facilities and equipment.

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