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Solid-state magnetic resonance is a unique technique that can reveal thedynamics of complex biological systems with atomic resolution. Longitudinalrelaxation is a mechanism that returns longitudinal nuclear magnetization toits thermal equilibrium by incoherent processes. The measured longitudinalrelaxation rate constant however represents the combination of both incoherentand coherent contributions to the change of nuclear magnetization. This workdemonstrates the effect of magic angle spinning rate on the longitudinalrelaxation rate constant in two model compounds: L-histidine hydrochloridemonohydrate and glycine serving as proxies for isotopically-enriched biologicalmaterials. Most notably, it is demonstrated that the longitudinal 15Nrelaxation of the two nitrogen nuclei in the imidazole ring in histidine isreduced by almost three orders of magnitude at the condition of rotationalresonance with the amine, while the amine relaxation rate constant is increasedat these conditions. The observed phenomenon may have radical implications forthe solid-state magnetic resonance in biophysics and materials, especially inthe proper measurement of dynamics and as a selective serial transfer step indynamic nuclear polarization.

Magic Angle Spinning Effects on Longitudinal NMR Relaxation: 15N in L-Histidine