EVIDENCE OF QUANTUM-SIZE EFFECT AND ELECTRON-PHONON INTERACTIONS IN RESONANCE RAMAN-SCATTERING SPECTRA OF SEMICONDUCTOR NANOCRYSTALS

Raman spectra of II-VI semiconductor nanocrystals embedded in silicate glass matrices with near-resonance and resonance excitation in the ra nge of electron transitions between size-quantized energy levels were studied. It is shown that only the transitions with angular momentum l = 0, 2 contribute to the resonance Raman enhancement. The influence o f the electron-phonon interaction on the Raman excitation profiles of the LO phonons and elastic vibrations of nanocrystals is analysed. The effect of the matrix on the intensities and frequencies of the low-fr equency Raman (LFR) bands and the possibilities of determining the par ticle size determination using LFR spectra are discussed.