Title

Infrared Spectroscopy: Photothermal

Document Type

Article

Journal/Book Title

Encyclopedia of Analytical Science

Publication Date

2004

Publisher

Elsevier

Volume

2

First Page

426

Last Page

430

Abstract

Photothermal spectroscopy is a class of optical analysis methods that measures heat evolved as a consequence of light absorption in an irradiated sample. In conventional spectrometric methods information is obtained by measuring the intensities of light transmitted, reflected, or emitted by the sample. In photothermal spectrometry, spectroscopic information is obtained by measuring the heat accompanying nonradiative relaxation. Because of the universality of the photothermal effect (e.g., heat evolution accompanies essentially all optical absorption), photothermal spectroscopy has diverse applications in chemistry, physics, biology, and engineering. Some applications and measurements in the analysis of solids are reviewed here.

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