stopped-flow cell

in spectrochemical analysis
https://doi.org/10.1351/goldbook.S06034
A small-volume absorption cell connected to a rapid mixing chamber.
Source:
PAC, 1988, 60, 1449. (Nomenclature, symbols, units and their usage in spectrochemical analysis - VII. Molecular absorption spectroscopy, ultraviolet and visible (UV/VIS) (Recommendations 1988)) on page 1454 [Terms] [Paper]