Abstract
The electronic and vibrational absorption spectra have been recorded on several TMTCF and DMtTCF salts, between 15 K and 300 K, in the infrared range. A quantitative approach is proposed to interpret these observations: 1. i) Vibronic lines are observed at any temperature in both the DMtTCF and the TMTCF series; they indicate the presence of electron phonon interactions as formally described by Rice's dimer model. 2. ii) The intense charge transfer band associated with mixed-valence systems in sulfur compounds can be fitted using a classical Drude-Lorentz model. A physical meaning of the involved parameters associated with this fit is proposed using an extended 1d Hubbard model.
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