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The overabundance of gas molecules in the coldest regions of space point to anon-thermal desorption process. Laboratory simulations show an efficientdesorption of CO ice exposed to ultraviolet radiation, known asphotodesorption, which decreases for increasing ice deposition temperature.However, the understanding of this abnormal phenomenon has remained elusive. Inthis work we show the same phenomenon, and in particular, a dramatic drop inthe photodesorption yield is observed when the deposition temperature is 19 Kand higher. Also the minimum ice thickness that accounts for a constantphotodesorption yield of CO ice is deposition temperature dependent, anobservation reported here for the first time. We propose that the keyparameters that dominate the absorbed photon energy transfer in CO ice, andcontribute to the measured photodesorption yields are the energy transferlength, single ice layer contributed desorption yield, and relative effectivesurface area. This set of parameters should be incorporated in astrophysicalmodels that simulate photodesorption of the top CO-rich ice layer on icy dustpopulations with the size distribution which is ice thickness related.

The key parameters controlling the photodesorption yield in interstellar CO ice analogs: Influence of ice deposition temperature and thickness