Circular dichroism,
\(k^{\rm{L}} – k^{\rm{R}}\), for vibrational transitions.
Note:
Vibrations in chiral molecules and materials absorb left circularly polarized radiation to a different extent than right circularly polarized radiation.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 768 (https://doi.org/10.1515/pac-2019-0203)