IUPAC - dispersion (for spectroscopic instruments) (D01793)

dispersion (for spectroscopic instruments)

https://doi.org/10.1351/goldbook.D01793

Dispersion of a material = \frac{d n}{d λ}

where

n

= refractive index and

λ

wavelength;

angular dispersion = \frac{d Φ}{d λ}

where

Φ

= angle; and

linear dispersion = \frac{d x}{d λ}

where

x

= separation of spectral lines. The reciprocal of the last-named quantity is more frequently used (

\frac{d λ}{d x}

), and is commonly expressed in

Å {mm}^{- 1}

Source:
Orange Book, 2^nd ed., p. 101 [Terms] [Book]

Citation: 'dispersion (for spectroscopic instruments)' 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.D01793 RIS BibTex EndNote

Div. V PDF Text XML JSON

Last revised: February 24, 2014

Alphabetical Index

Additional Indexes

Version 3.0.1 (7517 Terms)

dispersion (for spectroscopic instruments)