post-filter effect

in luminescence spectroscopy
This effect arises when the exciting beam does not fill the cell completely and @[email protected] is absorbed by the analyte and interfering impurities in the non-illuminated region facing the detector.
PAC, 1984, 56, 231. (Nomenclature, symbols, units and their usage in spectrochemical analysis-Part VI: molecular luminescence spectroscopy) on page 244 [Terms] [Paper]