monochromator

[mon-uh-kroh-mey-ter]
noun Optics.
a spectroscope with a slit that can be moved across the spectrum for viewing individual spectral bands.
Also called monochromatic illuminator.


Origin:
1905–10; monochromat(ic) + (illuminat)or

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Collins
World English Dictionary
monochromator (ˌmɒnəʊˈkrəʊmeɪtə)
 
n
physics a device that isolates a single wavelength of radiation

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

monochromator

instrument that supplies light of one colour or light within a narrow range of wavelengths. Unwanted wavelengths (colours) are blocked by filters (first used by Bernard Lyot in the 1930s) or bent away, as in the spectroheliograph. The monochromator is used to photograph the Sun and to study photochemical effects; it is usually a component of a spectrophotometer.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The first monochromator is vertically focused and the second can be either a vertically or a double focused unit.
Spikes were more frequent in the double-monochromator data than in that of the single monochromator.
The settings used will depend on the current monochromator selection.
In one set up, the incident beam was collimated by a silicon monochromator and the samples were rocked.
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