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      Vibronic Lineshapes of PTCDA Oligomers in Helium Nanodroplets

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          Abstract

          Oligomers of the organic semiconductor PTCDA are studied by means of helium nanodroplet isolation (HENDI) spectroscopy. In contrast to the monomer absorption spectrum, which exhibits clearly separated, very sharp absorption lines, it is found that the oligomer spectrum consists of three main peaks having an apparent width orders of magnitude larger than the width of the monomer lines. Using a simple theoretical model for the oligomer, in which a Frenkel exciton couples to internal vibrational modes of the monomers, these experimental findings are nicely reproduced. The three peaks present in the oligomer spectrum can already be obtained taking only one effective vibrational mode of the PTCDA molecule into account. The inclusion of more vibrational modes leads to quasi continuous spectra, resembling the broad oligomer spectra.

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          Most cited references 22

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          Organic Field-Effect Transistors

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            On the Transformation of Light into Heat in Solids. II

             J Frenkel (1931)
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              Chemistry and electronic properties of metal-organic semiconductor interfaces: Al, Ti, In, Sn, Ag, and Au on PTCDA

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                Author and article information

                Journal
                05 September 2010
                Article
                10.1063/1.3526749
                1009.0911

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                Custom metadata
                J. Chem. Phys. 134, 054907 (2011)
                cond-mat.other physics.chem-ph quant-ph

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