Dependence of absorbance of a sample on the type of polarization of the measuring beam. This polarization may be linear, corresponding to linear dichroism (LD
) in which the difference in absorption for two perpendicularly linearly polarized beams is measured, ΔAl = AZ - AY, or circular dichroism (CD
) in which the difference in absorption for left minus right circularly polarized beams is measured, ΔAC = AL - AR.
PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 324 (https://doi.org/10.1351/pac200779030293)