resonance hybrid

https://doi.org/10.1351/goldbook.RT07094
A localized @[email protected] bond representation of a molecule. This describes pictorially an electronic wavefunction that makes some contribution to the state wavefunction of the system. @[email protected] hybrids are needed to describe the state of a system when that system is not adequately described by a single Lewis structure.
Source:
PAC, 1999, 71, 1919. (Glossary of terms used in theoretical organic chemistry) on page 1961 [Terms] [Paper]