Mejía Guamán, Christian FernandoFerreira de Barros, Ana LucíaSeperuelo Duarte, EduardoDa silveira, Énio FrotaDartois, EmmanuelDomaracka, AlicjaRothard, HermannBoduch, Philippe2021-03-112021-03-1120151090-2643https://www.sciencedirect.com/science/article/abs/pii/S0019103514006812Porous water ice and water ice mixtures H2O:X (X = CO, CO2 and CH4) produced at 15 K, with film thicknesses in the 0.5–1 μm range, were irradiated by swift ions and monitored by mid-infrared spectroscopy (FTIR). The analysis of the evolution of the pure water ice infrared absorption on ion beam dose reveals a strong correlation among three quantities: (i) the absorbance of the most intense band (3250 cm−1), (ii) the wavelength of the maximum absorbance of this band and (iii) the absorbance of the OH-dangling bonds. This correlation is interpreted as indications of the water ice compaction by irradiation: as the beam fluence increases, the ice porosity decreases, the dangling bond peaks collapse and the area and position of the 3250 cm−1 band vary exponentially, all of them evolving with the same compaction cross section (). The linear dependence ( being the electronic stopping power) is observed for both pure and mixed water ices, confirming previous results. We suggests that the infrared absorption A-value varies with dose as during the compaction process ( eV/molec being the effective energy density to eliminate the OH-db, and is a parameter characterizing the porosity). These findings may be used as a diagnostic tool to probe the morphology of water ices occurring in the outer Solar System and in the ISM.es-ESCosmic raysSolar windIcesIR spectroscopyCollisional physicsARTÍCULO10.1016/j.icarus.2014.12.002