Wavelength references for the calibration of astronomical telescopes

"Thorium-argon hollow cathode lamps have long been used for wavelength calibration of spectrographs on ground-based astronomical telescopes. New high-resolution spectrographs, covering wavelengths up through the infrared \nregion, requiring new calibration sources that are convenient, inexpensive, and readily available. I shall describe activities at NIST in the past few years to address these needs, using high-resolution Fourier transform spectroscopy to produce reference data of Th\/Ar and U\/Ne hollow cathode lamps, gas cells, and fiber Fabrey-Perot interferometers."