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IR Spectroscopy and Photo-Chemistry of Extraterrestrial IcesDense molecular clouds from which planetary systems form and the outer Solar System are both cold environments dominated by ices. Infrared (IR) spectroscopy is used to probe these ices, but the IR absorptions of molecules depend on the conditions. As a result appropriate lab data is needed to correctly fit spectra of extraterrestrial ices. Such fits have shown that most of these ices are composed primarily of H2O, but also contain 1-10 percent of other simple molecules such as CO2, CO, CH4, & NH3;. We shall present near IR spectra of ice mixtures of relevance to icy outer Solar System bodies and show that they still hold surprises, such as the Cheshire cat-like CO2 (2v3) overtone near 2.134 micrometers (4685 cm-1) that is absent from spectra of pure CO2 but present in H2O-CO2 mixtures.
Document ID
20050182132
Acquisition Source
Headquarters
Document Type
Preprint (Draft being sent to journal)
Authors
Bernstein, Max P.
(NASA Ames Research Center Moffett Field, CA, United States)
Mastrapa, Rachel
(NASA Ames Research Center Moffett Field, CA, United States)
Elsila, Jamie
(NASA Ames Research Center Moffett Field, CA, United States)
Sandford, Scott
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 23, 2013
Publication Date
March 4, 2005
Subject Category
Exobiology
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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