Abstract
AbstractAn explicit formula expressing the refractive index in terms of exciton energies and oscillator strengths is used to calculate the absorption spectrum of the crystal at zero and non‐zero electric field; the electroabsorption signal is calculated as their difference, without any a priori assumptions regarding the shape of the individual EA fingerprints. The approach is applied for the sexithiophene crystal. The results show that an isolated Frenkel exciton always yields a first‐derivative EA signal, regardless of its intensity, and that this conclusion is not affected by polaritonic effects. For the specific case of sexithiophene, a satisfactory theoretical reproduction of the EA spectrum is possible only when the low‐energy charge‐transfer states are included. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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