Laboratory Studies of the CO2 Bending-Mode Feature in Annealed Ice Mixtures

Details Laboratory Studies of the CO2 Bending-Mode Feature in Annealed Ice Mixtures Laboratory Studies of the CO2 Bending-Mode Feature in Annealed Ice Mixtures

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21346603w&link_type=abstract

American Astronomical Society, AAS Meeting #213, #466.03; Bulletin of the American Astronomical Society, Vol. 41, p.414

Astronomy and Astrophysics

Astronomy

Scientific paper

Space-based observatories have detected an abundance of solid carbon dioxide (CO2) in dense regions of the interstellar medium and in the disks around protostars using infrared absorption spectroscopy. The absorption feature of solid CO2 near 658cm-1 (λ = 15.2μm) is a sensitive indicator of the physical conditions of the ice (e.g., its temperature and composition). Many previous experiments have been performed, but were focused on somewhat limited ranges of ice temperature and composition and generated specifically for comparisons to observed spectra from both the Infrared Space Observatory and the Spitzer Space Telescope. In the laboratory study described here, infrared spectra of ices containing H2O, CH3OH, and CO2 have been measured after annealing at different temperatures. The mid-infrared spectra (λ= 2.5-25μm) were measured for different ice compositions after warming up to temperatures ranging from 50K to near evaporation of the CO2 component (120-150K). This experimental procedure and range of temperatures chosen were intended to document the changes in the spectral profile of the CO2 bending mode after annealing events such as shock heating of interstellar clouds. Additional physical information, such as evaporation rates and sublimation energies for CO2, may also be obtained from our data.

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