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Non-thermal desorption of inter- and circum-stellar ice mantles on dustgrains, in particular ultraviolet photon-induced desorption, has gainedimportance in recent years. These processes may account for the observed gasphase abundances of molecules like CO toward cold interstellar clouds. Icemantle growth results from gas molecules impinging on the dust from alldirections and incidence angles. Nevertheless, the effect of the incident anglefor deposition on ice photo-desorption rate has not been studied. This workexplores the impact on the accretion and photodesorption rates of the incidenceangle of CO gas molecules with the cold surface during deposition of a CO icelayer. Infrared spectroscopy monitored CO ice upon deposition at differentangles, ultraviolet-irradiation, and subsequent warm-up. Vacuum-ultravioletspectroscopy and a Ni-mesh measured the emission of the ultraviolet lamp.Molecules ejected from the ice to the gas during irradiation or warm-up werecharacterized by a quadrupole mass spectrometer. The photodesorption rate of COice deposited at 11 K and different incident angles was rather stable between 0and 45$^{\circ}$. A maximum in the CO photodesorption rate appeared around70$^{\circ}$-incidence deposition angle. The same deposition angle leads to themaximum surface area of water ice. Although this study of the surface areacould not be performed for CO ice, the similar angle dependence in thephotodesorption and the ice surface area suggests that they are closelyrelated. Further evidence for a dependence of CO ice morphology on depositionangle is provided by thermal desorption of CO ice experiments.

Accretion and photodesorption of CO ice as a function of the incident angle of deposition