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A photoacoustic open cell with microphone registration has been used to determine thermal effusivity of liquids. Modification of the method has been proposed and tested. Application of the method for the investigation of structural changes in water solutions of polyethylene glycol 200 (PEG) is presented. The dependence of thermal effusivity of the solution on the PEG concentration has been compared...
The model describing relation between photoacoustic and absorption spectra in the case of spatial migration from the luminescence contre to the surface is presented and some results of its application to expalain experimental data obtain for YAG:Cr3 crystal are discussed.
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