title: Skylab 3600 groove/mm replica grating with a scandium-silicon multilayer coating and high normal-incidence efficiency at 38-nm wavelength.
abstract: A Sc-Si multilayer coating was applied to a replica of the 3600 groove/mm grating, developed for the SO82A spectroheliograph that flew on the Skylab mission, for the purpose of enhancing the normal-incidence efficiency in the extreme-ultraviolet region. The efficiency, measured at an angle of incidence of 6 degrees with synchrotron radiation, had a maximum value of 7.2% at a wavelength of 38 nm and was a factor of 3 higher than the efficiency of the gold-coated Skylab grating. The measured efficiency of the Sc-Si grating was in good agreement with the efficiency calculated by use of the modified integral method.
authors.affiliation: Naval Research Laboratory, Space Science Division, Washington DC 20375, USA. john.seely@nrl.navy.mil
authors.forename: John F
authors.initials: JF
authors.lastname: Seely
authors.forename: Yu A
authors.initials: YA
authors.lastname: Uspenskii
authors.forename: Yu P
authors.initials: YP
authors.lastname: Pershin
authors.forename: V V
authors.initials: VV
authors.lastname: Kondratenko
authors.forename: A V
authors.initials: AV
authors.lastname: Vinogradov