Franck-Condon processes in pentacene monolayers revealed in resonance Raman scattering

Rui He, Nancy G. Tassi, Graciela B. Blanchet, Aron Pinczuk

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Franck-Condon processes in pentacene monolayers are revealed in resonance Raman scattering from intramolecular vibrations. The Raman intensities from a totally symmetric vibrational mode display resonance enhancement double peaks when incident or scattered photon energies overlap the free exciton (FE) optical emission. The two resonances are of about equal strength. This remarkable symmetry in the resonance Raman profile suggests that Franck-Condon overlap integrals for the respective vibronic transitions have the same magnitude, which could be explained by the small displacement of potential energy curves along the configuration coordinate upon the FE excitation. The interference between scattering amplitudes in the Raman resonance reveals quantum coherence of the symmetry-split states (Davydov doublet) of the lowest intrinsic singlet exciton in pentacene monolayers.

Original languageEnglish
Article number115452
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number11
DOIs
StatePublished - Mar 29 2011

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