mono - Tunable Monochromator Introduction The job of a...

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Tunable Monochromator Introduction The job of a monochromator is to produce a single spectral line from a broadband (multi-wavelength) source. In spectrom- eters, this can be used to collect light from an atomic emission source, like the atomic emission detector, and allow only a specific line to exit. It can also be used to isolate a single line from a light source such as a hollow cathode lamp. The simple monochromator shown here is called a Czerny-Turner mono- chromator; however, other types are common. Source The instrument described here assumes that the input light is from a white light (a broadband source); although, many different inputs from which individual lines can be isolated are possible: a flame along with a hollow cathode lamp—as in AAS, a plasma—as in an atomic absorption spec- trometer, an ultraviolet source—as in a UV/Vis spectrometer, or in a fluorescence spectrometer, emission from a fluorescing sample. Entrance and Exit slits The purpose of the two slits in this monochromator is to control the size and “position” of the beam of light passing through the slit. On the way in, the entrance slit makes sure that only a small area of the input beam passes into the monochromator and that the light waves are relatively paral-
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mono - Tunable Monochromator Introduction The job of a...

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