where different coefficients for the two CT states have been used in case 𝑋𝑋 ≠ 𝑌𝑌, in which a single, directional CT state may dominate in an exciplex complex. In this regard, it is of interest to distinguish the term charge transfer, representing a specific, directional CT diabatic state, from super-exchange which describes a physical property, a resonance-stabilization interaction of the intermediate state. In eq 8, we have assumed that the order of excited states has not changed due to mixing with the CT states. This assumption is purposely for the convenience of expression; in practice, the correct state must be matched at different decomposition steps.