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\section{Theory}  The coupling between the excited state $i$ on molecule $I$ and excited state $j$ on molecule $J$ is  \begin{equation}  V_{IJ} = \int \int \iint  \mathrm{d}r \, \mathrm{d}r' \frac{\rho^T_{I,i}(r)\rho^T_{J,j}(r')}{|r-r'|} \end{equation}