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Amorphous solid water (ASW) is one of the most widely studied solid phasesystems. A better understanding of the nature of inter- and intramolecularforces in ASW is, however, still required to correctly interpret the catalyticrole of ASW in the formation and preservation of molecular species inenvironments such as the icy surfaces of Solar System objects, on interstellaricy dust grains and potentially even in the upper layers of the Earth'satmosphere. In this work, we have systematically exposed porous ASW (pASW) tomid-infrared radiation generated by a free-electron laser at the HFML-FELIXfacility in the Netherlands to study the effect of vibrational energy injectioninto the surface and bulk modes of pASW. During multiple sequentialirradiations on the same ice spot, we observed selective effects both at thesurface and in the bulk of the ice. Although the density of states in pASWshould allow for a fast vibrational relaxation through the H-bonded network,part of the injected energy is converted into structural ice changes asillustrated by the observation of spectral modifications when performingFourier transform infrared spectroscopy in reflection-absorption mode. Futurestudies will include the quantification of such effects by systematicallyinvestigating ice thickness, ice morphology, and ice composition.

IRFEL Selective Irradiation of Amorphous Solid Water: from Dangling to Bulk Modes