Coupling and scattering power exchange between phonon modes observed in surface-enhanced Raman spectra of single-wall carbon nanotubes on silver colloidal clusters - art. no. 193411

In the surface-enhanced Raman spectra of single-wall carbon nanotubes on si lver colloidal clusters, at high excitation laser intensities, we observed with increasing laser excitation intensity, an exchange in the scattering p ower between two phonon modes that constitute the 1590 cm(-1) feature of th e G band. We explain this effect in terms of phonon-phonon coupling, which occurs for the extremely strong Raman effect in intense optical fields in t he "hot" areas of silver clusters.