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A theory of excitation–energy transfer regarded as nonadiabatic transition and its comparison to Förster's theory
Author(s) -
Okuno Yoshishige,
Mashiko Shinro
Publication year - 2001
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.10048
Subject(s) - excitation , adiabatic process , coupling constant , chemistry , intermolecular force , atomic physics , reaction rate constant , constant (computer programming) , physics , coupling (piping) , transfer (computing) , energy transfer , vibronic coupling , quantum , quantum mechanics , molecule , mechanical engineering , parallel computing , computer science , kinetics , engineering , programming language
We propose a rate‐constant expression for an excitation–energy transfer between two molecules that is regarded as a nonadiabatic transition between two adiabatic electronic states. It is shown that under weak intermolecular interaction the approximately derived rate constant increases with the increase in pseudo‐Coulombic interaction \documentclass{article}\pagestyle{empty}\begin{document}$\langle \phi_{e}^{A}\phi_{g}^{B}|H|\phi_{g}^{A}\phi_{e}^{B}\rangle_{\mathbf{r}}$\end{document} and depends on the differences in the potential energies and the potential derivatives of the initial and final electronic states. In addition, the rate constant under strong interaction is shown to decrease with increasing pseudo‐Coulombic interaction. We show that our expression has the advantage that it can be applied to the excitation–energy transfer under the (not very) weak and the strong coupling limits which cannot be addressed by Förster's theory. © 2001 John Wiley & Sons, Inc. Int J Quantum Chem, 2001