NMR relaxation in multipolar AX systems under spin locking conditions.
A relaxation matrix has been calculated for a multipolar AX spin system under the on-resonance spin-locking condition. Auto- and cross-correlation terms between dipolar, quadrupolar, and CSA interactions are considered. It is shown that the spin-lock leads to many relaxation pathways being blocked, resulting in a considerably simplified relaxation network. The presence of spectral densities at zero frequency, associated with locked nuclei, allows efficient relaxation also in the absence of fast molecular motions.
Kaikkonen
A
A
Arrhenius Laboratory, Stockholm University, Stockholm, S-10691, Sweden.
Kowalewski
J
J
D009682:Magnetic Resonance Spectroscopy; D008962:Models, Theoretical; D011846:Radio Waves