Abstract
Depth profiling by photoacoustic spectroscopy (PAS) is experimentally demonstrated to be feasible in the mid-IR by changing the velocity of the moving mirror in a Fourier-transform infrared (FTIR) spectrometer. The main difficulty in this method originates from resonances of the PAS cell. The modulation frequency bandwidth implicit in an FTIR makes the system very sensitive to such resonances: spurious results are obtained when they are not taken into account. The current experimental investigation has shown that the dependence of resonance behaviour on sample characteristics alters the cell response with different samples, and must be considered in PAS depth profiling.
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