Preferred Label : double-wavelength spectroscopy;
IUPAC definition : 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-wavelength spectroscopy 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.;
Origin ID : D01854;
See also
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-wavelength spectroscopy 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.
