Photodesorption and product formation in UV-irradiated ices under ultra-high-vacuum conditions.

Details Photodesorption and product formation in UV-irradiated ices under ultra-high-vacuum conditions. Photodesorption and product formation in UV-irradiated ices under ultra-high-vacuum conditions.

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.141c&link_type=abstract

The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole

Astronomy and Astrophysics

Astrophysics

Scientific paper

The accretion and desorption processes of gas molecules on cold grains play an important role in the evolution of dense clouds and circumstellar regions around YSOs. Given the low temperatures of 10-20 K in dark cloud interiors, thermal desorption is negligible and most molecules are expected to stick to grains leading to depletion in the gas phase. Laboratory simulations of these processes under astrophysically relevant conditions are required for their understanding. The use of ultra-high-vacuum (UHV) conditions minimalizes contamination by background water accretion. This introduces a radical improvement, allowing the study of photodesorption and the detection of products at very low abundances in a water-free ice matrix. We performed UV-photoprocessing of pure ices of astrophysical interest: H2O, NH3, CH4, CO, CO2, O2, N2, H2S, and CH3OH under UHV conditions using ISAC. For ices with an absorption band in the infrared, the decrease in the column density was estimated as a function of irradiation time, measured by FTIR in transmittance, as well as the column density of the products. The photodesorbed molecules, and the volatile products released upon warm-up, were detected in situ by QMS.

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