A new vacuum ultraviolet-light source is described which emits a strong continuous emission spectrum from 1500A to 2250A. This source is constructed of Pyrex, is charged with xenon, and carries a fluorite window which allows the tube to be completely sealed off from the vacuum system. Microwave energy at a frequency of 2450 mc/sec is used to excite the emission. Molecular xenon is presumably responsible for the continuum and the main transition is probably 3Σu+→1Σg+ with some contribution from 1Σu+→1Σg+. The source has been used to photograph the Schumann-Runge absorption bands of oxygen in the first order of a 21-foot vacuum grating spectrograph.
P. G. WILKINSON and YOSHIO TANAKA, "New Xenon-Light Source for the Vacuum Ultraviolet," J. Opt. Soc. Am. 45, 344-349 (1955)