potential coupling

https://doi.org/10.1351/goldbook.08661
Coupling of vibrational displacements through terms in the vibrational potential energy. The second-order (quadratic) terms cause harmonic potential coupling while the cubic and higher terms cause anharmonic potential coupling.
See also: anharmonicity, harmonicity
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 760 [Terms] [Paper]
Citation: 'potential coupling' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08661 RIS BibTex EndNote
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