Preferred Label : hyperfine coupling;
IUPAC acronym : ESR;
IUPAC definition : The interaction between the spin magnetic moment of an unpaired electron and the nuclear
spin magnetic moments resulting in the splitting of the α (spin up) and β (spin down)
energy levels in an external magnetic field and, thus, in the multiplet pattern of
the ESR spectra of radical-like species and transition metal compounds. Two main contributions
to the hyperfine coupling are usually considered, Fermi contact and dipolar interactions.
The contact interaction is isotropic and related to the unpaired spin density at the
nucleus, ψσ 2. The dipolar interaction is anisotropic, and related to r-3, where
r is the distance between the atom holding the unpaired electron and the nucleus with
non-zero spin.;
Origin ID : HT07052;
Automatic exact mappings (from CISMeF team)
- See also
The interaction between the spin magnetic moment of an unpaired electron and the nuclear
spin magnetic moments resulting in the splitting of the α (spin up) and β (spin down)
energy levels in an external magnetic field and, thus, in the multiplet pattern of
the ESR spectra of radical-like species and transition metal compounds. Two main contributions
to the hyperfine coupling are usually considered, Fermi contact and dipolar interactions.
The contact interaction is isotropic and related to the unpaired spin density at the
nucleus, ψσ 2. The dipolar interaction is anisotropic, and related to r-3, where
r is the distance between the atom holding the unpaired electron and the nucleus with
non-zero spin.
