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

机译:并五苯单层的Franck-Condon过程在共振拉曼散射中显示

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摘要

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.
机译:并五苯单层中的弗兰克-康登过程在分子内振动的共振拉曼散射中得以揭示。当入射或散射的光子能量与自由激子(FE)光发射重叠时,来自完全对称振动模式的拉曼强度显示出共振增强双峰。这两个共振的强度大致相等。共振拉曼曲线的这种显着对称性表明,各个振动跃迁的弗兰克-康登重叠积分具有相同的大小,这可以用有限元激发时沿着配置坐标的势能曲线的较小位移来解释。拉曼共振中的散射幅度之间的干扰揭示了并五苯单层中最低固有单重态激子的对称分裂态(达维多夫双重态)的量子相干性。

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