Abstract
The nuclear spin relaxation in isotropic spin systems with I = 3 2 , I = 5 2 , and I = 7 2 in the nonextreme narrowing regime is analyzed. The effect of the higher rank multipoles (rank ⩾3) of the spin density operator on a 180°- τ i - Θ pulse experiment is twofold. The recorded NMR lineshape is τ 1 and φ dependent. The multiexponentiality of the spin-lattice relaxation may be exaggerated by recording the amplitudes of the Lorentzian-like signals, instead of the full integrated signal. The influence of the detection pulse angle φ is discussed and we suggest that by choosing the detection angle φ = 63° the effects of the higher multipoles may be diminished.
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