Aluminum Mirror Coatings in Space: A Study of the Decrease in Ultraviolet Normal Incidence Reflectance Produced by Controlled Oxidation of Evaporated Aluminum Mirror Surfaces

M. Grande*, W. M. Burton

*Awdur cyfatebol y gwaith hwn

Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddTrafodion Cynhadledd (Nid-Cyfnodolyn fathau)

Crynodeb

Pure aluminum is an excellent normal-incidence reflector at wavelengths longward of 90 nm. However in the terrestrial environment, a fresh surface undergoes rapid oxidation, which leads to severe reflectivity losses at wavelengths below 180 nm. Results of an experimental study indicate that in a spacecraft spectrometer constructed to conventional UHV standards, we anticipate an exposure of 10**4 L in one year can be anticipated which would reduce the 121. 6 nm reflectivity to 70% and the spectrometer throughput to 50%. The loss at 90 nm would be more severe. This represents a performance within the design requirements of the mission, but one which could clearly be improved considerably if the overall vacuum environment could be improved, for example by using large gettering areas on the walls of the spectrometer enclosure.

Iaith wreiddiolSaesneg
TeitlSurface and Interface Analysis
Tudalennau518
Nifer y tudalennau1
Cyfrol9
Argraffiad1-6
StatwsCyhoeddwyd - Gorff 1986
DigwyddiadSurf and Interface Anal, ECASIA 85, Proc of the Eur Conf on Appl of Surf and Interface Anal - Veldhoven, Neth
Hyd: 14 Hyd 198618 Hyd 1986

Cynhadledd

CynhadleddSurf and Interface Anal, ECASIA 85, Proc of the Eur Conf on Appl of Surf and Interface Anal
DinasVeldhoven, Neth
Cyfnod14 Hyd 198618 Hyd 1986

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