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Laser photoacoustic and photothermal spectroscopies as novel characterization methods for microparticles
Author(s) -
Kitamori Takehiko,
Sawada Tsuguo
Publication year - 1993
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4990300406
Subject(s) - photothermal therapy , materials science , microparticle , photothermal spectroscopy , laser , photoacoustic effect , characterization (materials science) , photoacoustic spectroscopy , photothermal effect , deflection (physics) , optics , spectroscopy , photoacoustic imaging in biomedicine , analytical chemistry (journal) , optoelectronics , nanotechnology , chemistry , physics , chromatography , quantum mechanics
Photoacoustic and photothermal spectroscopy methods can be effectively applied to the characterization of single microparticles. As the optical beam deflection method, in which a thermal wave generated by non‐radiative transition is detected by deflection of a probe beam, is sensitive for a single microparticle, and is a remote‐measurement method without using a cell, it is suitable for nondestructive characterization of microparticles. This method was applied to determination of chemical species adsorbed on a single microparticle, and spectral differences between leukemia and normal white blood corpuscles could be obtained. A more violent photothermal conversion phenomenon of a particle, laser breakdown and accompanying plasma and acoustic emission, was applied to individual detection and analysis of ultrafine particles in liquids. Laser‐like nonlinear emission from the plasma was observed.