Trends in the infrared and near infrared properties of organic conductors

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Abstract
It is demonstrated that the infrared spectrum of a typical organic linear chain conductor can be understood as follows. The near infrared shows typical plasmon behaviour, and it appears that the plasma frequency is related to the crystal structure and one-electron parameters as in ordinary metals. Thus band structure parameters can be derived and the infrared oscillator strength for the corresponding non-interacting electron gas can be predicted. In all cases the actual measured oscillator strength is significantly smaller. The information contained in this deviation can be quantified by means of a sum rule, which relates oscillators strength and electron kinetic energy. The latter is a measure of the Coulomb driven electron localisation.