Magnetic-dipole hyperfine interaction
= Magnetic-dipole hyperfine interaction
{title2=$H_{M1}=A\mathbf I\cdot\mathbf J$}
The interaction of a <nuclear magnetic moment> with the electronic magnetic field at the nucleus. Within an isolated electronic J manifold, rotational symmetry gives the displayed effective Hamiltonian for angular momenta in hbar units. Its adjacent F intervals obey the <Landé interval rule>.