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Optical Engineering

Mie scattering of growing molecular contaminants
Author(s): Kenneth A. Herren; Don A. Gregory
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Paper Abstract

Molecular contamination of optical surfaces from outgassed material has been shown in many cases to proceed from acclimation centers and to produce many roughly hemispherical "islands" of contamination on the surface. The mathematics of the hemispherical scattering is simplified by introducing a virtual source below the plane of the optic, in this case a mirror, allowing the use of Mie theory to produce a solution for the resulting sphere in transmission. Experimentally, a fixed wavelength in the vacuum ultraviolet was used as the illumination source and scattered light from the polished and coated glass mirrors was detected at a fixed angle as the contamination islands grew in time.

Paper Details

Date Published: 1 March 2007
PDF: 9 pages
Opt. Eng. 46(3) 033602 doi: 10.1117/1.2715944
Published in: Optical Engineering Volume 46, Issue 3
Show Author Affiliations
Kenneth A. Herren, NASA Marshall Space Flight Ctr. (United States)
Don A. Gregory, The Univ. of Alabama/Huntsville (United States)

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