Figure 4

(a) 2D 3QMAS spectra of facial Alq ₃ ( δ -phase). The optimised excitation pulse and conversion pulse lengths were 4.4 μs and 1.9 μs. Rest of the experimental parameters are as in Figure 3. (b) The anisotropic slice along the direction parallel to the F₂ dimension. (c) The isotropic projection along the F₁ dimension.