A luminescence spectrometer in which a single beam of radiation is used for excitation and a single beam of luminescence radiation is taken from the sample.
Source:
PAC, 1984, 56, 231. 'Nomenclature, symbols, units and their usage in spectrochemical analysis-Part VI: molecular luminescence spectroscopy' on page 238 (https://doi.org/10.1351/pac198456020231)