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ellipsometric study of metal samplesExposed and unexposed (shielded) portions of the surfaces of six different metal samples (Al, Cu, Ni, Ta, W, and Zr) that had been mounted on LDEF were studied by variable angle spectroscopic ellipsometry. The change in the optical constants of the metals caused by exposure to the space environment was measured. The measured optical constants reflect changes in the morphology and stoichiometry of a surface layer to a depth of this order of magnitude. For all the samples examined in this manner the exposed and unexposed portions exhibited dramatically different optical properties. In order to determine whether the observed changes were caused by the impact of oxygen atoms encountered in flight an experiment was set up in which samples identical to the original metal samples are exposed to a low-energy oxygen plasma in a microwave discharge chamber. Results of this experiment are reported, as well as an analysis of the observed data in terms of surface layers of different composition.
Document ID
19910015727
Document Type
Conference Paper
Authors
Franzen, W.
(Army Materials Technology Lab. Watertown, MA, United States)
Brodkin, Judy
(Army Materials Technology Lab. Watertown, MA, United States)
Sagalyn, Paul L.
(Army Materials Technology Lab. Watertown, MA, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1991
Publication Information
Publication: NASA, Langley Research Center, First LDEF Post-Retrieval Symposium Abstracts
Subject Category
METALLIC MATERIALS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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