dichroism

https://doi.org/10.1351/goldbook.DT07357
Dependence of @[email protected] of a sample on the type of @[email protected] of the measuring beam. This @[email protected] may be linear, corresponding to linear dichroism (LD) in which the difference in absorption for two perpendicularly linearly polarized beams is measured, \(\Delta A_{\text{l}} = A_{\text{Z}} - A_{\text{Y}}\), or circular dichroism (CD) in which the difference in absorption for left minus right circularly polarized beams is measured, \(\Delta A_{\text{C}} = A_{\text{L}} - A_{\text{R}}\).
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 324 [Terms] [Paper]