27 May 1996 Photochemically induced surface contamination: mechanisms and effects
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Abstract
Spacecraft function in a hostile environment of sunlight, charged particles, micrometeroids and debris, and their own self-induced contamination environment. Contamination can occur during fabrication and ground processing, or by very long term outgassing and transport processes on orbit. One of the most deleterious effects of contaminant films is that they increase the solar absorptance of optics, such as thermal control mirrors and solar cell cover slips. This paper will discuss the role of vacuum ultraviolet induced photochemistry in the deposition of contaminant films during the multi-year life of a spacecraft. Laboratory and spaceflight measurements leading to a one-photon "Langmuir" type model for the deposition mechanism will be presented. Measurements of visible and ultraviolet optical properties of photodeposited films will be described. The implications of these process for terrestrial optical systems, including a case history of similar effects in an ultraviolet laser system studied in this laboratory will be discussed.
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Graham S. Arnold, Graham S. Arnold, Kenneth T. Luey, Kenneth T. Luey, } "Photochemically induced surface contamination: mechanisms and effects", Proc. SPIE 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995, (27 May 1996); doi: 10.1117/12.240345; https://doi.org/10.1117/12.240345
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