Abstract
Raman scattering of the C-C vibration with ${\mathit{E}}_{2\mathit{g}2}$ symmetry in stage-2 C/Rb has been studied with different incident photon energies. Resonant enhancement occurs for laser energies in the blue region, close to the threshold for the valence- to conduction-band electronic transition ${\mathrm{\ensuremath{\Omega}}}_{\mathit{T}}$. The results were fitted with a two-band resonance enhancement model and the fitting procedure yields ${\mathrm{\ensuremath{\Omega}}}_{\mathit{T}}$=2.6\ifmmode\pm\else\textpm\fi{}0.15 eV, with a broadening of 0.13 eV. In the red spectral region, the Raman line exhibits a Fano-type distortion, indicating an interaction between the discrete one-phonon excited state, and a continuum which is attributed to electronic excitations.
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