The effect of spectral background due to impurities, solvent or radiation
scattering may be reduced if the difference in the absorbances of a sample measured at two selected
wavelengths is obtained. This is often achieved by repetitively switching from one
wavelength to the other. Double-
wavelengthspectroscopy does this automatically by allowing two beams of radiation of different wavelengths
to pass through the cell. One beam is fixed at a longer
wavelength and the other measures
absorbance while being scanned over a limited
wavelength range at shorter wavelengths.
Source:
PAC, 1988, 60, 1449
(Nomenclature, symbols, units and their usage in spectrochemical analysis - VII. Molecular
absorption spectroscopy, ultraviolet and visible (UV/VIS) (Recommendations 1988))
on page 1455
Cite as:
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.
https://doi.org/10.1351/goldbook.
