To generate the uncoupled parabaloids, the xy coordinates of the minima are set at the origin (0, 0) for the initial state and at (d, 0) for the final state. Next, the angles between ⃗ d, ⃗ p and ⃗ q are used to locate the minima of charge-separated states, working from the fact that the x-coordinates of the ET and PT diabatic states must sum to d, while the y-coordinates must sum to 0. The positions are thus given by: P T (x, y) = c P T ⋅ ⃗ p and ET (x, y) = c ET ⋅ ⃗ q