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Photothermal spectroscopy is a group of high sensitivity spectroscopy techniques used to measure optical absorption and thermal characteristics of a sample. The basis of photothermal spectroscopy is the change in thermal state of the sample resulting from the absorption of radiation. Light absorbed and not lost by emission results in heating. The heat raises temperature thereby influencing the sample thermodynamic properties. Measurement of the temperature, pressure, and/or density changes that occur due to optical absorption are ultimately the basis for the photothermal spectroscopic measurements.
Additional recommended knowledge
As with photoacoustic spectroscopy, photothermal spectroscopy is an indirect method for measuring optical absorption. Indirect methods do not measure light transmission or emission but rather measure an effect of sample absorption. The term "indirect" applies to the optical measurement, not the optical absorbance.
There are several methods and techniques used in photothermal spectroscopy. Each of these has a name indicating the specific physical effect measured.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Photothermal_spectroscopy". A list of authors is available in Wikipedia.|