Abstract
This paper provides physical discussions of factors controlling sensitivity in photothermal spectroscopy, in particular, photoacoustic spectroscopy and probe-beam deflection spectroscopy. Wc consider the physical basis for signal generation and enhancement methods for pulsed and continuous-modulated excitations as well as the various sources of noises which become significant when the absorption approaches the part-per-million level or below. Proper signal enhancement and noise suppression are essential to make photothermal spectroscopy a sensitive tool.
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