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A. 13C-detected 15N/13C HETCOR spectrum of a 15N, 13Cα NAL single crystal. B. 13C-detected 15N/13C HETCOR with 1H-irradiation at 40 kHz. The one-dimensional spectra aligned on the top and side are the same 13C and 15N CP spectra shown in Figure 2A and B, respectively. Note in Figure 3B that the signal from pair 1 is detectable only in the presence of 1H-irradiation. The experiments were performed with 1ms (shown) and 3ms 15N/13C mixing time with similar results.
