Abstract
At low temperatures the absorption spectra of CuCl-doped NaCl single crystals show the Z3 and Z1, 2 excitons of CuCl if CuCl exists in the crystalline state. A procedure is demonstrated for dividing the total oscillator strength observed between 3.0 and 5.5 eV into two parts, one is associated with the crystalline state of CuCl and the other with single copper ions. The excitons show blue shifts as a consequence of confinement effects that permit the determination of the average radius R of the CuCl nanocrystals. The transition from initial growth processes to the regime of Ostwald-ripening is demonstrated for growth temperatures between room temperature and 600 K.
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