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

Layer 2 — Chemistryin the chemical-physics subtree

The Franck-Condon principle (Franck 1925; Condon 1926) — the quantum-mechanical intensity law for electronic transitions between two Born-Oppenheimer-separated potential-energy surfaces (PES), assuming the transition is 'vertical' in…

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

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