We have studied polarized Raman spectra of (TMTSF) 2 PF 6 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) 2 PF 6 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.

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