Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p11b0111r&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #P11B-0111
Physics
5422 Ices, 5470 Surface Materials And Properties, 6020 Ices, 6055 Surfaces
Scientific paper
We have studied the effects of ion irradiation on the porosity of amorphous ice using infrared and ultraviolet-visible (uv-vis)spectroscopy. Our findings indicate that ion irradiation induces compaction in porous ice. The density of the ice films rises asymptotically to a saturation value with increasing ion fluence. Irradiation also decreases the intensity of the near 2.71 μm absorption features assigned to O-H stretch in dangling water molecules present in porous ice films. However, we find that the ion fluence required for disappearance of the dangling O-H stretch absorption features can only partially compact the ice films. Low fluence irradiation (< 1013 ions/cm2) can transform pristine ice films such that it retains significant porosity (~ 50 %) but lack water molecules with dangling bonds. We also performed a series of experiments with methane on ice films to investigate the effects of the dangling water molecules on gasadsorption and desorption.
Baragiola Raúl A.
Loeffler Mark J.
Raut Ujjwal
Teolis B. D.
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