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Most conventional photoacoustic spectroscopy of solids has employed a periodically modulated light source. The availability of high-intensity pulsed light sources of short pulse duration makes possible the study of the time response of a photoacoustic system in which the solid is excited by a single optical pulse. A one-dimensional theoretical model is presented in which the time dependence of the photoacoustic response is evaluated for systems of variable optical absorption coefficient and sample thickness. The analysis is restricted to the case for which nonradiative relaxation processes occur instantaneously on the time scale of the measurement. Typical response curves for optically excited systems are presented and interpreted in terms of physical processes occurring in the cell.
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Mandelis et al. (1979) studied this question.
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