Abstract

In a recent review we have discussed the photoacoustic (PA) generation of plane acoustic waves in strongly absorbing or opaque liquids by pulsed laser radiation [1]. Good agreement with respect to acoustic waveforms and amplitudes has been found between experimental data and an analytical model for the two regimes of a free and a confined surface of the liquid. For the first time, we have performed laser-PA spectroscopy on opaque liquids as well as on absorbing liquid surface films spread on liquids, i.e. at liquid/liquid interfaces [2]. New spectroscopic results on solidified compared to liquid films of > 0.5 µm thickness present on the surface of water have been discussed recently [3]. Here we present a preliminary analytical model for PA studies on liquid surface films. Its predictions are compared with experimental data.

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