The construction of a sensitive spectrophosphofluorimeter is reported. The sensitivity of the detection system has been increased by the use of a cooled selected photomultiplier and a lock-in amplifier or time averaging computer. Essential accessories are the electronic ratio system and the xenon arc stabilization device with a stabilization factor up to 10 3 . Measurements of decay times greater than 0·1 ms for weak signals are possible with this instrument.
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Langelaar et al. (1969) studied this question.
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