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dispersion (for spectroscopic instruments)

Dispersion of a material = d n d λ where n = refractive index and λwavelength; angular dispersion = d Φ d λ where Φ = angle; and linear dispersion = d x d λ where x = separation of spectral lines. The reciprocal of the last-named quantity is more frequently used ( d λ d x), and is commonly expressed in Å mm −1.
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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.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.D01793.
Original PDF version: http://www.iupac.org/goldbook/D01793.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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