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Use of a Demountable Hollow Cathode Lamp as a Light Source for Alignment of Secondary Slits of an Optical Emission Spectrometer

Simultaneous multielement analysis using a direct reading optical emission spectrometer requires that some means of correcting for optical drift be provided. This is generally achieved either by adjusting a refractor plate or the slit frame to obtain peak spectral line intensity through the slits of monitor detectors on each phototube slit frame. The 2-m Quantometer (model 9500, Applied Research Laboratories, Sunland, CA) in our laboratory uses slits and detectors for mercury lines as monitor channels on each of four phototube slit frames. Each of the four slit frames is adjusted for peak intensity through the corresponding monitor slit at the beginning of each work shift. The light source for this slit-profiling operation is a quartz jacketed mercury lamp. This profiling technique, requiring only a few minutes, is convenient and is quite adequate as long as each element secondary slit remains in peak profile at the same adjustment position as its corresponding mercury monitor channel.