A pulsed laser photoacoustic technique is described. It is optimized for the simultaneous investigations of multiphoton absorption processes as well as rotational relaxation and vibration relaxation studies. The experimental procedure is presented, concerning the calibration of the photoacoustic detectorlcell set-up, applying the transmission spectroscopy technique. The obtained relationships, which can b e alternatively used for the sensitivity cuNe S(p, y. T) of the apparatus, are analysed. A previously proposed model is confirmed.
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