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Photoacoustic Detection of Weak Absorption Bands in Infrared Spectra of Calcite.


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 rapid-scan 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.

SUBMITTER: Campbell S 

PROVIDER: S-EPMC8255507 | biostudies-literature |

REPOSITORIES: biostudies-literature

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