Abstract
We show that noise can be reduced significantly at certain frequencies in spectrometer systems that use arc-lamp sources if the image of the lamp is oriented perpendicular to the entrance slit of the spectrometer. This appears to be a result of aligning the direction of arc wander along, rather than across, the slit. Data on a specific system show a reduction in the appropriate Fourier component of the power density spectrum by a factor of 4.
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