Astronomy and Astrophysics – Astronomy
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p21a..05r&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P21A-05
Astronomy and Astrophysics
Astronomy
5422 Ices, 5460 Physical Properties Of Materials, 6020 Ices, 6200 Planetary Sciences: Solar System Objects
Scientific paper
Vapor-deposited water ice is believed to be present in astronomical environments such as interstellar grains, planetary rings, comets, and icy satellites. Some salient properties are its amorphous molecular structure and its microporosity, which determines its capacity to absorb gas. Since in most astronomical environments these ices are subject to radiation it is important to determine the effect of radiation on porosity. We have studied in the laboratory the effects of ion irradiation on the porosity of amorphous ice using ultraviolet-visible spectroscopy and infrared spectroscopy. Our findings indicate that ion irradiation compacts porous ice. The density of the ice film rises asymptotically to a saturation value with increasing ion fluence. Irradiation also decreases the intensity of the ~ 2.7 μm absorption features assigned to the O-H stretch of dangling molecules present in porous ice film. However, we find that the dangling bond features decrease at a faster rate than the ice porosity. To investigate this contrasting behavior, we performed gas adsorption/desorption experiments on ice films irradiated to different fluences of 100 keV Ar+ ions. We will discuss how these measurements can be used to obtain pore size distributions and changes induced via ion irradiation. Finally, our results open the possibility that ices can remain porous, even if the dangling bond features are not present, which is of particular interest in colder regions such as interstellar ices.
Baragiola Raúl A.
Famá Marcelo
Loeffler Mark J.
Raut Ujjwal
Teolis B. D.
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