The Franck-Condon Principle ·
Why Electronic Transitions Are Vertical
un
seel
.com · vertical transition · vibronic overlap · Stokes shift
state
ground X ¹Σ
lands on
v′ = 0
FC factor
|⟨χ′|χ″⟩|²
step
—
ground surface X
excited surface B (displaced)
vertical transition (photon)
vibrational overlap / progression
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