A theoretical model is presented for the time-domain photoacoustic response of a condensed sample with a two-level optical-absorption band. The nonradiative lifetime of the excited state and the transfer function of the pressure transducer are included in the formalism. The limitations of the technique for nonradiative lifetime measurements are discussed and the experimental conditions necessary for optimum relaxation time determinations are evaluated. It is found that the limitations imposed by the modified gas thermal transport equations used in the model restrict it to relaxation times greater than ∼10−5 sec. This is of the same order as the limit imposed on experimental measurements by the transfer function of commercial microphones.
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Mandelis et al. (1980) studied this question.
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