The BRV source, which emits continuum light in far uv wavelengths, is suitable for use as the background continuum in studies of absorption spectra. Methods of generating wavelength standards for these spectra are discussed, and a list is given of wavelengths of emission lines that can be generated in the source and are useful as secondary standards.
G. H. Newsom, "Wavelength Standards for Use with a BRV Source," Appl. Opt. 13, 2712-2715 (1974)