Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540..231p&link_type=abstract
In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla
Physics
Space Environment, Materials, Contamination
Scientific paper
Molecular contamination of spacecraft surfaces is one of the most critical in-orbit problems contributing to material degradation. Effects on sensitive surface properties are often dramatic; solar absorptance and infrared emittance of thermal control materials can especially be altered. Moreover, these effects can worsen with UV radiation because of photochemical reactions, involving a better fixation of contaminants and a creation of chromophores in deposited films. In order to study the synergistic effects of contamination and solar ultraviolet, a test facility has been developed. A series of measurements have been performed with and without UV radiation-induced deposition of contaminant, outgassed products of a pure molecule model. Samples have been examined with different analytical techniques. This paper presents the comparison of results of ground laboratory tests with a multi-layer physical modelling of the main mechanisms emphasizing UV photo-deposition.
Faye Delphine
Guyt J. M.
Pereira Antonio
Roussel Jean-François
Schmeitzky O.
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