Inductive-resonant theory of nonradiative transitions for complex organic molecules in condensed phase

Ours and literature data on influence of replacement of deuterium by protiu m in complex organic molecules on nonradiative triplet-singlet transition r ates are discussed from the standpoint of the inductive-resonant theory of this process. It has been shown that the extent to which the protium introd uction in molecule affects the nonradiative rate depends on distance betwee n protium atom and the vibronic molecular oscillator of triplet-singlet tra nsition and on pi-electronic density near-by protium.