IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Surface Science Tuesday Sessions
       Session SS3-TuP

Paper SS3-TuP16
COsmic COcktails: CO-ice Chemistry under Interstellar Conditions

Tuesday, October 30, 2001, 5:30 pm, Room 134/135

Session: Adsorption/Desorption Poster Session
Presenter: H.J. Fraser, Leiden University, Netherlands
Authors: H.J. Fraser, Leiden University, Netherlands
W.A. Schutte, Leiden University, Netherlands
E.F. van Dishoeck, Leiden University, Netherlands
Correspondent: Click to Email
Ices are observed throughout the universe: on planetary bodies, comets, in the Interstellar Medium and in protoplanetary disks. In the laboratory it is possible to study the chemistry and physics of molecular ices under pseudo interstellar conditions. Our experiment combines UHV surface science techniques with an atomic beam to study chemical reactions occurring on interstellar ice grain mimics. The experiment is aimed at identifying the key barrierless reactions and desorption pathways on ices of H@sub 2@O and CO that generate simple molecular species in the gas phase. In this poster we will present results illustrating the desorption rate of CO ice when H@sub 2@ is formed from H recombination reactions on the ice surface, and identify the reaction products formed during thermal warm-up, e.g. HCO, CO@sub 2@, H@sub 2@O, HCOOH. We will also present results on the reaction between CO and O, before, during and after ice processing by UV irradiation. The chemical and astronomical implications of these results will be discussed.