J-Coupling

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Electronic nucleon-to-nucleon coupling.

"J-coupling (also called indirect dipole dipole coupling) is the coupling between two nuclear spins due to the influence of bonding electrons on the magnetic field running between the two nuclei. J-coupling contains information about dihedral angles, which can be estimated using the Karplus equation. It is an important observable effect in 1D nuclear magnetic resonance spectroscopy." More: Wikipedia.org

See also