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Proceedings Paper

Photochemical processes in a two-component molecular contaminant film
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Paper Abstract

Previously, significant laboratory work has been performed on the photochemical deposition and darkening of molecular contaminant films. Much of this work addresses single, purified molecular species to understand fundamental photochemical processes. However, some of this work disagrees with other studies involving mixed, real spacecraft materials. There are also points of disagreement with contaminated returned optics from the Hubble Space Telescope where mixed contaminants were found. In this paper, we describe a method for vacuum depositing a controlled, reproducible contaminant film containing two molecular species: tetramethyl-tetraphenyl trisiloxane (DC 704) and dioctyl phthalate (DOP). We use this film to show differences in photochemical processes compared to a pure film of DC 704. We show that some photopolymerization processes occur more slowly in a two-component, mixed film during accelerated exposure to vacuum ultraviolet (VUV) radiation.

Paper Details

Date Published: 2 September 2008
PDF: 12 pages
Proc. SPIE 7069, Optical System Contamination: Effects, Measurements, and Control 2008, 706903 (2 September 2008); doi: 10.1117/12.793502
Show Author Affiliations
Kenneth T. Luey, The Aerospace Corp. (United States)
Dianne J. Coleman, The Aerospace Corp. (United States)

Published in SPIE Proceedings Vol. 7069:
Optical System Contamination: Effects, Measurements, and Control 2008
Sharon A. Straka, Editor(s)

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