Raman Scattering From TMTSF-Salts

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Abstract
Experimental results for Raman scattering from TSeF, TMTSF-D12, (TMTSF)2PF6 and (TMTSF)2AsF6 excited with blue-green laser light at liquid nitrogen temperature are reported. A strong resonance effect for excitation of TMTSF with 4579 Å was observed and an assignment for the ag modes was obtained by comparison with results from TTF. Methyl group modes were identified at 328 cm−1, 472 cm−1 and 916 cm−1, respectively. Charging the TMTSF molecule resulted in a strong frequency shift of -122 cm−1 and -76 cm−1 for the agu2 mode, respectively. A study of the temperature dependence of the scattering from molecular modes between 2 K and 300 K did not reveal any correlation with the phase transitions in the conducting compounds.