Journal
OPTICS AND SPECTROSCOPY
Volume 99, Issue 6, Pages 968-974Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/1.2149422
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A new approach to the photothermal spectroscopy of solids and liquids is proposed on the basis of the thermocapillary effect, which arises when a laser beam excites a layer of liquid several hundreds of millimeters thick lying on a solid surface. The method uses the measurement of the diameter of a thermocapillary response or the counting of the number of fringes of equal thickness observed in the light reflected from a thermocapillary depression. The detectability threshold and the resolution of the method correspond to absorbed optical powers of, respectively, 500 and 100 mu W in the first case and 500 and 10 mu W in the second case. (c) 2005 Pleiades Publishing, Inc.
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