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Polariton Effects in Molecular Crystals Studied by Classical and Quantum-Electrodynamic Approaches

100%
Stradomska A., Petelenz P.
Acta Physica Polonica A
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2007
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vol. 112
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issue S
S-161-S-170
EN
A quantum-electrodynamic approach is studied as an alternative to the classical description of polaritons in molecular crystals, with the focus on future interpretation of oligothiophene spectra. As expected, the results of the two approaches coincide, but the quantum description is better suited for future generalizations, notably for detailed studies of vibronic coupling. The quantum approach is used here to probe the importance of inherent polaritonic effects. They are found to be minor, being superseded by vibronic interactions; the latter are responsible for most peculiarities observed in oligothiophene spectra.
2
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Exciton Electro-Absorption at Non-Zero Wave Vector

100%
Slawik M., Petelenz P.
Acta Physica Polonica A
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1995
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vol. 88
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issue 2
401-409
EN
Based on a previously proposed two-dimensional model of a polyacene crystal, the contributions to the electro-absorption signal from different points of the exciton Brillouin zone are calculated. They are shown to differ substantially both in amplitude and in shape. This makes electro-absorption spectra very sensitive to vibronic coupling. On the one hand, the new factor is a potential complication in theoretical interpretations. On the other hand, it favours electro-absorption spectroscopy as a promising experimental tool to study vibronic effects.
3
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Cluster Model of Charge Transfer Excitons in Molecular Crystals. I. Neat Crystals

100%
Petelenz P., Eilmes A.
Acta Physica Polonica A
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1991
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vol. 79
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issue 5
727-738
EN
A two-dimensional finite cluster model is proposed to describe the coupling of low energy charge transfer and Frenkel states of an anthracene-like molecular crystal. The results confirm most of the qualitative conclusions of the extensively used linear crystal model, but suggest the necessity to review some of its quantitative results. Potential usefulness of the cluster model for the description of doped crystals is pointed out.
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