  We have studied polarized Raman spectra of (TMTSF)2PF6 single crystals in the
wide spectral and temperature range using different laser energies. We observed
and assigned 23 Raman active modes. The carbon C=C in-phase and out-of-phase
stretching modes at 1464 cm-1 and 1602 cm-1 show strong
electron-molecular-vibration coupling. The mode at about 1565 cm-1 is
temperature independent below 50 K due to the methyl group motion freezing. For
(TMTSF)2PF6 in the spin density wave phase for a temperature induced
dimensionality 1D (quarter filled dimerized linear chain with correlated
electrons) the spin gapless magnon spectra have been calculated. No evidence of
spin-lattice coupling or spin-related modes is found in the Raman spectra in
the spin density wave phase.
