Abstract
AbstractA new approach to vibronic coupling in molecular crystals is proposed. The underlying model describes an infinite 3‐dimensional crystal with two or four molecules in the unit cell. One Frenkel state and one vibrational mode per molecule is taken into account. The approach is rooted in the approximation of strong vibronic coupling, which is extended by taking into account the 2‐particle and 3‐particle contributions in order to cover the intermediate‐coupling region. The results of numerical calculations are presented for sexithiophene; they are discussed in the context of finite cluster models and their validity. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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