X-ray induced desorption and photochemistry in CO ice
Résumé
We report an investigation of X-ray induced desorption of neutrals, cations and anions from CO ice. The desorption of neutral CO, by far the most abundant, is quantied and discussed within the context of its application to astrochemistry. The desorption of many dierent cations, including large cations up to the mass limit of the spectrometer, are observed. In contrast, the only desorbing anions detected are O − and C −. The desorption mechanisms of all these species are discussed with the aid of their photodesorption spectrum. The evolution of the X-ray absorption spectrum shows signicant chemical modications of the ice upon irradiation, which along with the desorption of large cations gives a new insight into X-ray induced photochemistry in CO ice.
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