title: In situ preparation of thin sodium films as an expendable filter in the vacuum ultraviolet.
abstract: The use of a sodium film as a filter for wavelengths between 40 and 80 nm is discussed, and a technique to prepare these films is described. Sodium films of 230 nm thickness were demonstrated to have a transmission of 55% at 100 degrees K at a wavelength 41 nm. The transmission decreased to 40% after 18 h in a vacuum of 5x10(-8) Torr. Films of this thickness were shown to attenuate 20.5-nm radiation appearing in second order at 41 nm by at least a factor of 50.
authors.affiliation: Synchrotron Ultraviolet Radiation Facility, National Bureau of Standards, Washington, D.C. 20234Physics Department, The University of Tennessee, Knoxville, Tennessee 37916Health and Safety Research Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830Health and Safety Research Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830.
authors.forename: D L
authors.initials: DL
authors.lastname: Ederer
authors.forename: T A
authors.initials: TA
authors.lastname: Callcott
authors.forename: E T
authors.initials: ET
authors.lastname: Arakawa