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Charge resonance bands description

The neutral ir-conjugated polymer chain is free of excess charges. The neutral chain has a set of Raman active Ag vibrations that are strongly couple to the electronic bands by the e—p coupling [64]. These vibrations have been termed as amplitude modes (AM) since they modulate the electronic gap, 2A in the notation of Peierls gap [65]. The AM vibrations have been the subject of numerous studies and reviews since they play a crucial role in resonant Raman scattering dispersion with the laser excitation, and therefore can show important properties of the coupled electronic levels [66,67]. The most successful description of the AM-type vibrations was advanced by Horowitz [65], and its application to RRS by Vardeny et al. [64] and Ehrenfreund et al. [67]. [Pg.950]

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See also in sourсe #XX -- [ Pg.331 ]



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