The effect of permanent hole burning is studied in absorption spectra of quantum sized CdS nanocrystals with the mean diameter of about 30 angstroms and wide size distribution embedded in polymeric film. The selective photoexcitation of appropriate CdS quantum dots followed by their ionization and further irreversible oxidation of CdS phase by holes h+ is considered to be responsible for this effect.
The spectrometer is described designed for studies of the small deviations in inhomogeneously broadened systems under selective laser excitation as well as for time-resolved analysis of irreversible photochemical processes after single-shot excitation. The set-up includes tunable pulse laser and registration system based on CCD-array. Computer control and built-in memory for 256 frames provide sensitivity of about 0.002 optical density units when studying differential absorption spectra and time-resolved single shot spectral measurements in the millisecond range.
Excitonic processes in CuCl nanospheres of mean radius ranging from 2 to 15 nm embedded in a glass matrix are investigated. Specific features resulting from quantum confinement are analyzed. Correlation between nonlinear-optical and photochemical changes have been revealed. The possibility of application of the same structure in the reversible and irreversible optical memory devices is discussed.
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