Electron-Vibration Coupling in Semiconductor Clusters Studied by Resonance Raman Spectroscopy.

The resonance Raman spectrum of 45angstroms diameter CdSe clusters was measured. The incident photons were resonant with the lowest exciton transition in the clusters. At low temperature, one mode at 205cm sup (-1) is observed, as well as two overtones, with the integrated areas under these peaks in the ratio of 9:3:1. This mode is assigned as the longest wavelength longitudinal optical vibration of the cluster. The strength of the coupling between the lowest electronic excited state and the LO vibration is found to be twenty times weaker in these clusters than in the bulk solid. The CdSe cluster resonance Raman spectrum is shown to be consistent with the recently measured homogeneous cluster absorption spectrum.