Optical effects of photochemically deposited contaminant films

Graham S. Arnold; Rolaine C. Young Owl; David F. Hall

doi:10.1117/12.22619

1 November 1990 Optical effects of photochemically deposited contaminant films

Graham S. Arnold, Rolaine C. Young Owl, David F. Hall

Proceedings Volume 1329, Optical System Contamination: Effects, Measurement, Control II; (1990) https://doi.org/10.1117/12.22619
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

Two aromatic hydrocarbons bibenzyl (BB) and dodecahydrotriphenylene (DTP) have been studied in an ongoing contaminant effects measurement program. Photochemical deposition of these molecules did not proceed quickly under conditions which result in the deposition of dark tenacious films from phthalate siloxane and alkene precursor molecules. Additional measurements show that DTP probably does not deposit photochemically at a substantial rate because the quantum yield for photodeposition is small not that a DTP molecule does not reside on the surface long enough to absorb light. The initial sticking coefficient of DTP appears to depend on surface temperature. Films of DTP scatter visible and near-ultraviolet light very efficiently which is consistent with the observed heats of vaporization and desorption for this molecule. 1.

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Graham S. Arnold, Rolaine C. Young Owl, and David F. Hall "Optical effects of photochemically deposited contaminant films", Proc. SPIE 1329, Optical System Contamination: Effects, Measurement, Control II, (1 November 1990); https://doi.org/10.1117/12.22619

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