Computer Science – Databases
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1087..544o&link_type=abstract
PROTECTION OF MATERIALS AND STRUCTURES FROM SPACE ENVIRONMENT: Proceedings of the 9th International Conference: Protection of Ma
Computer Science
Databases
Photoemission And Photoelectron Spectra, Astronomical Observations, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc., Artificial Earth Satellites
Scientific paper
Satellites have come to play many roles depending on their purpose, including communication, weather observation, astronomy observation, and space development. A satellite requires long life and high reliability in such a situation. However, at an altitude of several hundred kilometers, atomic oxygen (AO) is a destructive factor. With density of about 1015 atoms/m3, AO also has high reactivity. As the satellite collides with AO, surface materials of the satellite are degraded, engendering surface roughness and oxidation. Accordingly, it is necessary to monitor the surface conditions.
In this study, photoemission characteristics of several materials, such as metals, glasses, and polymers are measured using a deuterium lamp and band pass filters. The threshold energy for photoemission and the quantum efficiency were evaluated from those measurements. Consequently, for the investigated materials the threshold energies for photoelectron emission were found to be 4.9-5.7 eV. The quantum efficiency of metals is about 100 times higher than that of other samples. The quantum efficiency of PS that includes a benzene ring is several times higher than that of either PP or PTFE, suggesting that deteriorated materials emit large amounts of photoelectrons.
Iwao Toru
Miyake Hiroaki
Nitta Kumi
Okamura Shugo
Yumoto Motoshige
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