Spectral emission lines of gases from 20 to 200 nm, Rich source of VUV spectral lines
Model 629 Hollow Cathode Source

McPherson, Inc. The Model 629 Hollow Cathode Light Source is a continuous gas discharge source that can be used with molecular or rare gases. It is electrically quiet and is a rich source of vacuum ultraviolet (VUV) spectral lines (to at least 20-nm (62-eV.) The source is a Schueler-type lamp which produces strong ion lines. It differs principally from a capillary discharge source in that the negative glow of the discharge is viewed directly, rather than through the positive column of neutral gas.