Abstract
An analytical expression is derived for the energy in an acoustic wave resulting from pulsed laser excitation of optically thin samples. Assumptions used to derive this expression include a small temperature increase due to optical absorption, a time-independent expansion limited by the acoustic wave propagation time, and a finite sample length. These results are described and then analyzed in terms of the degree to which acoustic energy loss would affect photothermal spectroscopy signals. It is found that the acoustic energy loss can be neglected in most pulsed laser-excited photothermal spectroscopic measurements of optically thin samples.
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