Abstract
In the frame of the density matrix formalism the lineshapes and dynamic frequency shifts in the multiplet structure of a spinI = 1/2 scalar coupled to a quadrupolar nucleus with a spinS ≥ 1 undergoing dipolar (D), quadrupolar (Q) and chemical shift anisotropy (CSA) relaxation are studied. Analytic expressions for the cross-correlation spectral densities JQ-CSA, JD-Q, JD-CSA and also for the real and imaginary Redfield elements of the relaxation matrix were obtained in the general case of noncoincident and nonaxial Q, D, and CSA tensors. On the assumption that CSA and Q interactions are comparable in magnitude the contributions of cross-correlation terms CSA-Q, CSA-D, Q-D in the linewidth and dynamic shifts of the multiplet pattern of a spinI = 1/2 were analyzed in a wide interval of correlation times (10−12-10−7 s) for a spin system13C-11B and31P-59Co as an example.
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