Fermi Resonance ·
When Two Vibrations Trade Identities
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.com · CO₂ dyad · ν₁ vs 2ν₂ · intensity borrowing
gap δ
large
coupling W
≈50 cm⁻¹
mixing
0 / 100
step
—
ν₁ symmetric stretch (bright)
2ν₂ bend overtone (dark)
coupling W (cubic k₁₂₂)
observed Fermi dyad
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