Absorption spectroscopy of molecular trimers

Seibt, Joachim; Dehm, Volker; Würthner, Frank; Engel, Volker
April 2007
Journal of Chemical Physics;4/28/2007, Vol. 126 Issue 16, p164308
Academic Journal
Absorption properties of molecular trimers are studied within a model including a single monomer internal vibrational degree of freedom. Upon photoabsorption, three excited electronic states which are coupled excitonically are accessed. Band shapes resulting from different electronic coupling strengths and geometries are analyzed. It is shown that geometric information can be extracted from the band intensities. Taking data recorded for perylene bisimide aggregates as an example, the spectra for monomer, dimer, and trimer systems are compared.


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