Vibronic Coupling - Definition

Definition

Vibronic coupling describes the mixing of different electronic state as a result of small vibrations.

\mathbf{f}_{k' k}\equiv\langle\,\chi_{k'}(\mathbf{r};\mathbf{R})\,|\, \hat{\nabla}_\mathbf{R}\chi_k(\mathbf{r};\mathbf{R})\rangle_{(\mathbf{r})}

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