Abstract
The chemical evolution of star forming regions and the role of dust grains as sites for molecule formation and mantle growth are topics of much current interest (e.g., van Dishoeck et al., 1993; Whittet, 1993). Both theoretical models and observational evidence suggest the existence of at least two phases of mantle growth in molecular clouds, leading to the occurrence of distinct H2O-rich and CO-rich ice phases (d’Hendecourt et al., 1985; Tielens et al., 1991).
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Chiar, J.E., Whittet, D.C.B., Adamson, A.J., Kerr, T.H. (1996). Observations of CO Ices in Molecular Clouds. In: Greenberg, J.M. (eds) The Cosmic Dust Connection. NATO ASI Series, vol 487. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5652-3_9
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