Inductively-coupled plasma optical emission spectrometer configuration in which the plasma and the entrance slit are perpendicular and from which the signal is taken perpendicularly to the main plasma axis.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 731 (https://doi.org/10.1515/pac-2019-0203)