Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Molecular Electronics and Excited State Properties

CPP 26.2: Talk

Tuesday, March 21, 2017, 14:15–14:30, ZEU 260

Tuning nonradiative lifetimes via molecular aggregation — •Alan Celestino and Alexander Eisfeld — MPIPKS, Dresden, Germany

We show that molecular aggregation can strongly influence the nonradiative decay (NRD) lifetime of an electronic excitation. As a demonstrative example, we consider a transition-dipole-dipole-interacting dimer whose monomers have harmonic potential energy surfaces (PESs). Depending on the position of the NRD channel (q_nr), we find that the NRD lifetime (τ_nr^dim) can exhibit a completely different dependence on the intermolecular-interaction strength. We observe that (i) for q_nr near the Franck-Condon region, τ_nr^dim increases with the interaction strength; (ii) for q_nr near the minimum of the monomer excited PES, the intermolecular interaction has little influence on τ_nr^dim; (iii) for q_nr near the classical turning point of the monomer nuclear dynamics, on the other side of the minimum, τ_nr^dim decreases with the interaction strength.

[1] arXiv:1611.09115 [physics.chem-ph]