Laboratory experiments on interstellar ice analogs: the sticking and desorption of small physisorbed molecules

Fuchs, G. W.; Acharyya, K.; Bisschop, S. E.; Öberg, K. I.; van Broekhuizen, F. A.; Fraser, H. J.; Schlemmer, S.; van Dishoeck, E. F. and Linnartz, H. (2006). Laboratory experiments on interstellar ice analogs: the sticking and desorption of small physisorbed molecules. In: NASA Laboratory Astrophysics Workshop, 14-16 Feb 2006, Las Vegas, Nevada, UK.

URL: http://www-cfadc.phy.ornl.gov/nasa_law/

Abstract

Molecular oxygen and nitrogen are difficult to observe since they are infrared inactive and radio quiet. The low O₂ abundances found so far combined with general considerations of dense cloud conditions suggest molecular oxygen is frozen out at low temperatures (< 20 K) in the shielded inner regions of cloud cores. In solid form O₂ and N₂ can only be observed as adjuncts within other ice constituents, like CO. In this work we focus on fundamental properties of N₂ and O₂ in CO ice-gas systems, e.g. desorption characteristics and sticking probabilities at low temperatures for different ice morphologies.

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