Resonant low-frequency Raman scattering experiments performed on CdS-d
oped glasses reveal two kinds of peaks: the first one is due to the en
tire nanoparticle distribution and is observed for excitation below th
e absorption structures of the nanoparticles. The second peak is obser
ved when exciting resonantly the nanoparticles and is due to the reson
antly excited nanoparticles only; this is a size selective excitation.
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