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Schematic of the experimental setup. “Detector” refers to either a monochromator backed with a photo-multiplier/photodiode array or to a photodiode.
Emission spectrum from a LED and associated unabsorbed baseline obtained by the ratio of two spectra acquired with interval and a similar baseline obtained with a Xe arc source for comparison.
Absorption spectrum of the radical in a (100:30) plasma recorded with the LED.
Time variations of the absorption rate and of the corresponding density measured during a gas in/plasma on /plasma off/gas off sequence.
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