Resonant Raman scattering in a bis-tetramethyltetraselenafulvalene-hexafluorophosphate [(TMTSF)2PF6] single crystal

Raman scattering experiments have been performed on a (TMTSF${)}_2$ ${\mathrm{PF}}_6$ single crystal. Resonant effects have been found for a laser excitation in the vicinity of 6450 Å. The latter experiment has allowed us to detect and identify many internal modes of the TMTSF molecule. Also, external modes have been recorded and identified. One of them is strongly Raman resonant, and is responsible for the electronic charge transfer which characterizes this one-dimensional conductor.