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What Is Fermi Resonance In IR Spectroscopy?

What Is Fermi Resonance In IR Spectroscopy? -- Fermi resonance is an important phenomenon in IR spectroscopy where two vibrational modes, of similar energy and the same symmetry, interact and "mix." This typically occurs when an overtone or combination band (which would normally be weak) accidentally has an energy very close to that of a fundamental vibrational mode. Instead of appearing as two distinct, separate bands, the interaction causes a splitting of the observed peaks, resulting in two new bands with altered frequencies and intensities. The energy is effectively shared between the two interacting modes, making both appear stronger than they would individually, and pushing their frequencies apart. This effect can complicate spectral interpretation, as a single fundamental vibration might appear as a doublet, or a normally weak overtone can gain significant intensity, making it resemble a fundamental. Recognizing Fermi resonance is crucial for accurate assignment of IR bands and understanding molecular vibrations. ⚠️ Disclaimer: Videos are created for educational purposes only and do not constitute professional, medical, financial, or legal advice. Always seek guidance from qualified professionals for specific concerns. 🔗 Subscribe-    / @openanswers   🔗 Video-    • What Is Fermi Resonance In IR Spectroscopy?