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Designed to achieve spectral line source requirements, the hollow cathode lamps (HCL) permit the intense emission of resonance lines, narrow line width for maximum sensitivity and linearity, minimal spectral interference from continuum emission, and rapid warm-up to produce stable, long-term light emission. Used primarily in physics and chemistry applications, these inert gas based light sources support atomic absorption spectrometers and lasers for frequency tuning. Operating without noise, the hollow cathode lamps feature hermetically sealed glass that fills cleanly with gas. Select models with single element lamps and multi elements are available.