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Auger spectroscopic examination of MgF2-coated Al mirrors before and after UV irradiationMagnesium fluoride protected Al films were studied since these mirrors are commonly used in astronomical instruments whenever a highly reflecting optical surface is required in the wavelength region from 1100 A to 2000 A. Freshly prepared samples of evaporated Al + 250-A thick MgF2 on glass were analyzed by Auger electron spectroscopy in conjunction with surface erosion by Ar(+) ion bombardment before and after UV irradiation. The analysis showed that a very thin layer of surface contamination and not bulk photolysis in the MgF2 film was reponsible for the irradiation-induced reflectance loss. Postirradiation polishing with a mild calcium carbonate abrasive can restore a mirror's reflectance by removing the photolyzed surface film without disturbing the MgF2 layer.
Document ID
19770055219
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Heaney, J. B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Herzig, H.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Osantowski, J. F.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1977
Subject Category
Optics
Accession Number
77A38071
Distribution Limits
Public
Copyright
Other

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