Photoacoustic Detection of Weak Absorption Bands in Infrared Spectra of Calcite

Campbell, Stephen and Dusseault, Marisa and Xu, Ben and Michaelian, Kirk H. and Poduska, Kristin M. (2021) Photoacoustic Detection of Weak Absorption Bands in Infrared Spectra of Calcite. Applied Spectroscopy, 75 (7). pp. 795-801. ISSN 1943-3530

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Abstract

Photoacoustic spectroscopic detection of infrared absorption often produces spectra with enhanced intensities for weaker peaks, enabling the detection of features due to overtones and combinations, as well as less-abundant isotopic species. To illustrate this phenomenon, we present and discuss photoacoustic infrared spectra of calcite. We use linearization of rapidscan spectra, as well as comparing step-scan and rapid-scan spectra, to demonstrate that saturation is not the driving force behind these enhanced intensities. Our results point to a significant knowledge gap, since a theoretical basis for the enhancement of these weak bands has not yet been developed.

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