Laboratory experiments on interstellar ice analogs: The sticking and desorption of small physisorbed molecules
Molecular oxygen and nitrogen are difficult to observe since they are infrared inactive and radio quiet. The low O_2 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 O_2 and N_2 can only be observed as adjuncts within other ice constituents, like CO. In this work we focus on fundamental properties of N_2 and O_2 in CO ice-gas systems, e.g. desorption characteristics and sticking probabilities at low temperatures for different ice morphologies.
NASA LAW 2006
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