Скачать или смотреть What Is Vibrational Coupling In IR Spectroscopy?

What Is Vibrational Coupling In IR Spectroscopy? -- Vibrational coupling in IR spectroscopy describes the interaction and mixing of two or more vibrational modes within a molecule, particularly when they possess similar energies and appropriate symmetry. Instead of vibrating independently, these modes become correlated, leading to a redistribution of energy. The most common manifestation is Fermi resonance, where an overtone or combination band interacts with a fundamental mode. This coupling results in observed frequencies shifting from their expected positions, often pushing them further apart, and can also alter their intensities. It effectively creates new "mixed" normal modes that are combinations of the original uncoupled vibrations. While making spectral interpretation more complex, vibrational coupling provides valuable insights into molecular structure, symmetry, and dynamics by revealing how different parts of a molecule influence each other's motions, leading to a more accurate understanding of the molecule's vibrational landscape.


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