Term: double-beam spectrometer (for luminescence spectroscopy)
https://doi.org/10.1351/goldbook.D01842

Definition:
Double (spectral) beam spectrometers are used where two samples are to be excited by two different wavelengths. A double- (synchronous) beam spectrometer is a luminescence spectrometer in which both the excitation and emission monochromators scan the excitation and emission spectra simultaneously, usually with a fixed wavelength difference between excitation and emission.

Related Terms:
1) synchronous (http://doi.org/10.1351/goldbook.S06219).
2) spectrometer (http://doi.org/10.1351/goldbook.S05837).
3) luminescence spectrometer (http://doi.org/10.1351/goldbook.L03645).
4) wavelength (http://doi.org/10.1351/goldbook.W06659).

Source: Orange Book, 2nd ed., p. 191 (https://media.iupac.org/publications/analytical_compendium/)

Citation: 'double-beam spectrometer (for luminescence spectroscopy)' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.D01842

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