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The desorption characteristics of molecules on interstellar dust grains are important for modelling the behaviour of molecules in icy mantles and, critically, in describing the solid–gas interface. In this study, a series of laboratory experiments exploring the desorption of three small molecules from three astrophysically relevant surfaces is presented. The desorption of CO, O 2  and CO 2  at both submonolayer and multilayer coverages was investigated from non‐porous water, crystalline water and silicate surfaces. Experimental data were modelled using the Polanyi–Wigner equation to produce a mathematical description of the desorption of each molecular species from each type of surface, uniquely describing both the monolayer and multilayer desorption in a single combined model. The implications of desorption behaviour over astrophysically relevant time‐scales are discussed.

monthly notices of the royal astronomical society

Thermal desorption characteristics of CO, O 2  and CO 2  on non‐porous water, crystalline water and silicate surfaces at submonolayer and multilayer coverages