Molecular contamination of an EUV instrument in geosynchronous orbit

Jack T. Sanders Jr.

doi:10.1117/12.555901

15 October 2004 Molecular contamination of an EUV instrument in geosynchronous orbit

Jack T. Sanders Jr.

Proceedings Volume 5526, Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control; (2004) https://doi.org/10.1117/12.555901
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Molecular contamination of ultraviolet (UV) optics has been well characterized at wavelengths longer than 120 nm, and some tests have been done at very short wavelengths (10 nm). Characterization of molecular contamination effects at intermediate wavelengths is scarce. This paper draws a parallel between organic light filters and molecular contaminants, considering the contaminant as an extra organic film on an existing filter. This allows the analyst to use Henke light absorptance analysis to characterize extreme ultraviolet (EUV) light attenuation. This technique shows that peak light attenuation occurs near 73 nm (17 eV), rather than the previously assumed 121.6 nm, due to the preferential ejection of 2s electrons in carbon near 17 eV.

Citation Download Citation

Jack T. Sanders Jr. "Molecular contamination of an EUV instrument in geosynchronous orbit", Proc. SPIE 5526, Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control, (15 October 2004); https://doi.org/10.1117/12.555901

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