1982
DOI: 10.1016/0009-2614(82)80019-5
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Temperature-dependent dephasing of delocalized dimer states of pentacene in p-terphenyl: picosecond photon echo experiments

Abstract: Optical dephasing of pentacene dimers in p-terphenyl is studied. Dimer states R3 and R4 exhibit an exponential temperature activation of T2' which is inconsistent with a mechanism involving scattering between delocalized dimer states.Other dephasing mechanisms are discussed. An upper limit is placed on the relaxation rate from the upper dimer state, R1, to R3.

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Cited by 22 publications
(2 citation statements)
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“…By analogy to other systems, the dephasing mechanism described by the exponential activation term in eq 1 might reflect either a librational motion as observed in various dimers in crystalline host materials, activation of a narrow band optical phonon of the host as observed in glasses, ,, or activation of a transition to another electronic level . In particular, scattering from the lowest to the upper dimer exciton level induced by linear electron−phonon coupling in mixed crystals of naphthalene dimers in perdeuteronaphtalene 52 gave rise to an exponential temperature dependence of the photon echo decay.…”
Section: Discussionmentioning
confidence: 94%
“…By analogy to other systems, the dephasing mechanism described by the exponential activation term in eq 1 might reflect either a librational motion as observed in various dimers in crystalline host materials, activation of a narrow band optical phonon of the host as observed in glasses, ,, or activation of a transition to another electronic level . In particular, scattering from the lowest to the upper dimer exciton level induced by linear electron−phonon coupling in mixed crystals of naphthalene dimers in perdeuteronaphtalene 52 gave rise to an exponential temperature dependence of the photon echo decay.…”
Section: Discussionmentioning
confidence: 94%
“…The relative time delay between excitation pulse pairs is labeled τ 2 , while the relative time delay between the probe pulse and the first excitation pulse pair is labeled τ 4 . When inhomogeneous contributions to the line shape are present, the second coherence will cause a rephasing of the first coherence when τ 2 = τ 4 , resulting in an echo-like signal analogous to photon echo spectroscopy. , The signal generated meets the phase-matching requirements k s = ( k 1 − k 2 ) − ( k 3 − k 4 ) + k 5 ; in a non-collinear phase-matching geometry, this results in a unique signal direction making spatial isolation possible.
1 Pulse sequence (top) and energy level diagram (bottom) for third-order (left) and fifth-order (right) Raman spectroscopy.
…”
Section: Introductionmentioning
confidence: 99%