CO2 synthesis in solid CO by Lyman-α photons and 200 keV protons

Details CO2 synthesis in solid CO by Lyman-α photons and 200 keV protons CO2 synthesis in solid CO by Lyman-α photons and 200 keV protons

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...435..587l&link_type=abstract

Astronomy and Astrophysics, Volume 435, Issue 2, May IV 2005, pp.587-594

Astronomy and Astrophysics

Astrophysics

38

Astrochemistry, Molecular Processes, Methods: Laboratory, Techniques: Spectroscopic, Ism: Molecules, Infrared: Ism

Scientific paper

We have studied the synthesis of carbon dioxide from solid carbon monoxide at 16 K induced by photolysis with Lyman-α photons and by irradiation with 200 keV protons to quantitatively compare the effects of photolysis and ion irradiation on CO ice and to determine the importance of these processes in interstellar ice grains. The CO and CO{2} concentrations during irradiation of an initially pure CO film evolve with fluence to a saturation value, a behaviour that is explained by a two-state model. Our results indicate that the initial CO{2} production rates for both radiation processes are similar when normalized to the absorbed energy and that the solid CO{2} abundance observed in the interstellar ices cannot be explained only by radiolysis and photolysis of pure solid CO.

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