Abstract
The temperature dependence of the spectral properties of dimerized TCNQ salts is explained in terms of an isolated dimer model. The cases of one and two electrons per dimer are considered separately, because the electron-electron interaction should be treated in an explicit way in these solids. An important new observation is that the changes in electronic interactions depend both on frequency and temperature. Hence, the thermal changes in the spectral properties manifest themselves by the variations of molecular band intensities and by the shift of their positions. The analysis of the Re (1/σ(ω)) function, which can be calculated from reflectivity data, is claimed to allow the temperature dependence of the electron-molecular vibration coupling parameters to be determined unambiguously.
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