Variant of
spatially offset Raman spectroscopy in which a sample is illuminated with a ring of laser light and the
Raman scattering is collected from the centre of the ring.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 752 (https://doi.org/10.1515/pac-2019-0203)