Franck-Condon: FC(v=0, S=0) = 1; FC(v=0, S) = exp(-S); Σ_v FC(v, S) = 1 (Poisson norm)

Layer 2 — Chemistryin the chemical-physics subtree

Sympy-exact symbolic witness of the Franck-Condon Poisson-distribution anchors. Setup: FC(v, S) = exp(-S)·S^v/v! as a sympy expression with S positive symbol, v non-negative integer. Canonical form (v = 0 specialisation): FC_0_0_sym =…

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Franck-Condon framework: |⟨v|0'⟩|² = exp(-S)·S^v/v! (Poisson-distributed harmonic-oscillator overlaps)
Partition function

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