Controlling the porosity of amorphous solid water

Details Controlling the porosity of amorphous solid water Controlling the porosity of amorphous solid water

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..marw26003p&link_type=abstract

American Physical Society, Annual APS March Meeting, March 18 - 22, 2002 Indiana Convention Center; Indianapolis, Indiana Meetin

Astronomy and Astrophysics

Astronomy

Scientific paper

Amorphous solid water films are nanoporous when grown below 120 K, a property that has important implications in astronomical objects like comets, icy satellites, the rings of planets in the outer solar system, and ice-coated interstellar grains. Our optical studies in ultrahigh vacuum show that the porosity of vapor-deposited ice films increases with a decrease of the deposition angle to the surface and with a decrease in the deposition temperature. We find that thermal annealing causes compaction (decrease in porosity) due to a diffusionless process, possibly energyzed by stresses that develop during growth. Compaction also results by irradiation with keV ions, a significant finding since astronomical ices are normally subject to energetic particle irradiation.

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