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The heat resulting from the radiationless relaxation of electronic excitations in solids can be followed thermometrically on a submicrosecond time scale using a superconducting bolometer as detector. Details of the technique are described, and illustrated with the relaxation profiles of Cr(III) ion excited in Al2O3, LiTaO3, and MgO host lattices.
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Robin et al. (1977) studied this question.
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