Pake-type powder spectrum

Figure 5. NMR spectra of the radial left) and bipolar droplet right) for different values of the diffusion parameter A A = 0 corresponds to the no-diffusion limit, while A = 32 corresponds to the fest diffusion limit. Radial droplet The Pake-type powder spectrum obtained for A = 0 collapses into a single line centered at zero quadrupolar splitting for A = 32. Bipolar droplet The mckgnetic field is aligned along the bipolar symmetry ajds, which results in a spectrum consisting of two lines both in absence of diffusion and in the fest diffusion limit.

We now turn to radial droplets for which, in absence of external fields (with 1) = 0) and for T = 0.8 the hedgehog -like structure is stable. As discussed above, the spectrum of the radial droplet for 7/ = 0 is the Pake-type powder pattern consisting of two asymmetric peaks at S(jJqS [25],... 

For a random distribution of pp angles in a powder sample, a superposition of the doublets with different splittings gives rise to a Pake-type spectrum [28]. 

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