On electrodynamics of extended multiphonon transitions and nature of the J-band

The overall current picture of elementary electron transfer in condensed ma tter, derived from the Landau-Zener type theories, is revised to incorporat e, among other things, an unusual resonance between the electron and enviro nmental nuclear reorganization motion. Here, we construct a radically new t heory of photoinduced electron transfer (beyond the Landau-Zener ideology), or, more precisely, electrodynamics of extended multiphonon transitions in the light of which the nature of the well-known narrow J-band is due to ju st this resonance, not to averaging an environmental statistical disorder b y the quickly moving Frenkel exciton as is generally believed. (C) 2001 Els evier Science B.V. All rights reserved.