Cross correlation between the dipole-dipole interaction and the Curie spin relaxation: the effect of anisotropic magnetic susceptibility.
Cross-correlated relaxation caused by the interference of nuclear dipole-dipole interaction and the Curie spin relaxation (DD-CSR cross relaxation) is generalized to treat the case of anisotropic magnetic susceptibility, including the important case where the latter originates from zero-field splitting. It is shown that the phenomenon of DD-CSR cross relaxation is absolutely general and to be expected under any electronic configuration. The results of the generalization are presented for a model system, and the consequences for paramagnetic metalloproteins are illustrated with an example of cerium(III)-substituted calbindin. The effects of the magnetic anisotropy are found to be substantial.
Bertini
I
I
CERM and Department of Chemistry, University of Florence, Via L. Sacconi, 6, I-50019 Sesto Fiorentino, Italy.
Kowalewski
J
J
Luchinat
C
C
Parigi
G
G
D016880:Anisotropy; D004578:Electron Spin Resonance Spectroscopy; D008433:Mathematics