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Table 1 Basis functions (normalized) used to construct the diabatic molecular wavefunctions. The {A, B} denotes the spatially symmetric (singlet) combination (A1B2 + A2B1)(α1β2 - α2β1) where α, β are "up" and "down" spin functions and A, B are spatial MO's.

From: He2+-He charge transfer collisions using a 27-state close-coupled calculation with a diabatic molecular basis

Singlet g-state

Singlet u-state