Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.0610l&link_type=abstract
American Astronomical Society, DPS meeting #29, #06.10; Bulletin of the American Astronomical Society, Vol. 29, p.968
Astronomy and Astrophysics
Astronomy
Scientific paper
Chemical changes that occur during the photoprocessing of cosmically abundant ices have important implications in atmospheric physics and planetary astronomy. In this paper, we present results of a study of CO2 and CO2-water ices to investigate the chemical changes that are induced by X-radiation. The CO2 and CO2-water ices were formed at liquid nitrogen temperature in an ultra high vacuum environment and continuously bombarded with high intensity K_α radiation for up to ten hours in the analysis chamber of an X-ray photoelectron spectrometer (XPS). Significant changes in the core level line shapes associated with these ices were found in the X-ray photoelectron spectra recorded during the processing. A quadrupole mass spectrometer was used to monitor the species evolving from the surface during the processing, and the results were correlated with XPS results. Possible mechanisms associated with the photochemical processing are discussed. This research was supported in part by the NAU Organized Research Program and the NASA Origins of Solar System Program.
Cornelison D. M.
Dillingham Randy T.
Lutz Barry L.
Ruppart W. R.
Tegler Stephen C.
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