Carbon monoxide entrapment in interstellar ice analogs

Collings, M. P.; Dever, J. W.; Fraser, H. J.; McCoustra, M. R. S. and Williams, D. A. (2003). Carbon monoxide entrapment in interstellar ice analogs. Astrophysical Journal, 583(2) pp. 1058–1062.

DOI: https://doi.org/10.1086/345389

Abstract

The adsorption and desorption of CO on and from amorphous H₂O ice at astrophysically relevant temperatures has been studied using temperature programmed desorption (TPD) and reflection-absorption infrared spectroscopy (RAIRS). Solid CO is able to diffuse into the porous structure of H₂O at temperatures as low as 15 K. When heated, a phase transition between two forms of amorphous H₂O ice occurs over the 30–70 K temperature range, causing the partial collapse of pores and the entrapment of CO. Trapped CO is released during crystallization and desorption of the H₂O film. This behavior may have a significant impact on both gas-phase and solid-phase chemistry in a variety of interstellar environments.

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