Photochemical processes in a two-component molecular contaminant film

Kenneth T. Luey; Dianne J. Coleman

doi:10.1117/12.793502

2 September 2008 Photochemical processes in a two-component molecular contaminant film

Kenneth T. Luey, Dianne J. Coleman

Proceedings Volume 7069, Optical System Contamination: Effects, Measurements, and Control 2008; 706903 (2008) https://doi.org/10.1117/12.793502
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

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.

Citation Download Citation

Kenneth T. Luey and Dianne J. Coleman "Photochemical processes in a two-component molecular contaminant film", Proc. SPIE 7069, Optical System Contamination: Effects, Measurements, and Control 2008, 706903 (2 September 2008); https://doi.org/10.1117/12.793502

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