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CO 2 INFRARED PHONON MODES IN INTERSTELLAR ICE MIXTURES
Ist Teil von
The Astrophysical journal, 2016-11, Vol.832 (1), p.5
Ort / Verlag
American Astronomical Society
Erscheinungsjahr
2016
Link zum Volltext
Quelle
EZB Free E-Journals
Beschreibungen/Notizen
ABSTRACT CO 2 ice is an important reservoir of carbon and oxygen in star- and planet-forming regions. Together with water and CO, CO 2 sets the physical and chemical characteristics of interstellar icy grain mantles, including desorption and diffusion energies for other ice constituents. A detailed understanding of CO 2 ice spectroscopy is a prerequisite to characterize CO 2 interactions with other volatiles both in interstellar ices and in laboratory experiments of interstellar ice analogs. We report laboratory spectra of the CO 2 longitudinal optical (LO) phonon mode in pure CO 2 ice and in CO 2 ice mixtures with H 2 O, CO, and O 2 components. We show that the LO phonon mode position is sensitive to the mixing ratio of various ice components of astronomical interest. In the era of the James Webb Space Telescope , this characteristic could be used to constrain interstellar ice compositions and morphologies. More immediately, LO phonon mode spectroscopy provides a sensitive probe of ice mixing in the laboratory and should thus enable diffusion measurements with higher precision than has been previously possible.