Theory of NMR Shifts and ENDOR Spectroscopy in Paramagnetic ln Complexes

Abstract

The interactions of magnetic hyperfine spectroscopy are expressed in irreducible tensoroperator form, suitable for applications to configurations ln with n equivalent electrons outside closed shells. The matrix elements are evaluated on the basis of Racah’s techniques. The familiar point-dipole approximation of the pseudocontact interaction is valid for n ≦ 2l + 1; a minus sign, however, must be introduced in this formula for n > 2l + 1.