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Title: Compaction of porous ices rich in water by swift heavy ions
Authors: Mejia Guaman, Christian Fernando
Ferreira de Barros, Ana Lucia
Seperuelo Duarte, Eduardo
Da silveira, Énio Frota
Dartois, Emmanuel
Domaracka, Alicja
Rothard, Hermann
Boduch, Philippe
metadata.dc.ucuenca.correspondencia: Mejia Guaman, Christian Fernando, christian.mejia@ucuenca.edu.ec
Keywords: Cosmic rays
Solar wind
Ices
IR spectroscopy
Collisional physics
metadata.dc.ucuenca.areaconocimientofrascatiamplio: 1. Ciencias Naturales y Exactas
metadata.dc.ucuenca.areaconocimientofrascatidetallado: 1.3.8 Astronomía(Incluye Astrofísica, Ciencia Espacial)
metadata.dc.ucuenca.areaconocimientofrascatiespecifico: 1.3 Ciencias Físicas
metadata.dc.ucuenca.areaconocimientounescoamplio: 05 - Ciencias Físicas, Ciencias Naturales, Matemáticas y Estadísticas
metadata.dc.ucuenca.areaconocimientounescodetallado: 0533 - Física
metadata.dc.ucuenca.areaconocimientounescoespecifico: 053 - Ciencias Físicas
Issue Date: 2015
metadata.dc.ucuenca.volumen: Volumen 250
metadata.dc.source: Icarus
metadata.dc.identifier.doi: 10.1016/j.icarus.2014.12.002
metadata.dc.type: ARTÍCULO
Abstract: 
Porous 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.
URI: https://www.sciencedirect.com/science/article/abs/pii/S0019103514006812
metadata.dc.ucuenca.urifuente: https://www.sciencedirect.com/journal/icarus
ISSN: 1090-2643
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