Optical device that transmits a mechanically selectable narrow band of wavelengths
of electromagnetic radiation chosen from a wider range of wavelengths available at the input.
To spatially separate the wavelengths, a monochromator can use either the
phenomenon of optical dispersion in a prism, or that of diffraction
using a grating.
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 372
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook