COMMENTS ON PHOTOACOUSTIC AND PHOTOTHERMAL SPECTROSCOPY OF GASES COMPARED TO OPTICAL METHODS

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Abstract
We discuss the influence of some critical parameters, especially the pressure, on the sensitivity of photoacoustic and photothermal methods for high resolution spectroscopy. We show that these methods lose their sensitivity in the sub-Doppler regime where they are advantageously replaced by optical detection (for which the shot noise limit can be reached with high frequency modulation techniques) or by detection of the internal excitation energy carried by the molecules onto a bolometer

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