Optics and Fluid Dynamics Department
And The Graduate School in Nonlinear Science
Ion and photon radiation processes of ices and astronomical implications
Laboratory for Atomic and Surface Physics,
Thornton Hall, University of Virginia
Charlottesville, VA 22901
Interstellar grains, icy satellites and comets are subject to irradiation by energetic particles and ions. The resulting radiation physics and chemistry alter the surfaces and affect their optical reflectance. We perform laboratory experiments to answer questions posed by astronomical observations. Gases are condensed on cold surfaces (5-150 K) in vacuum and Irradiated by 5-100 keV ions or 10.2 eV photons (Lyman-alpha). We study reflectance changes, erosion (sputtering), and gases evolved during and after irradiation. The seminar will discuss results, current models, and unsolved questions in this area.
Tuesday 10 August 1999 at 11:00 Hrs.
in the FYS Meeting Room Building 130
RISØ National Laboratory, 4000 Roskilde