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NCA ZQ (n=±1) SPECIFIC-CP optimal matching conditions as identified in Figure 1 in either units of kHz or multipliers of the MAS frequency (ωr). The MAS frequency during the experiments was 14 kHz.
| Matching condition | Rf field ω1 | ||
|---|---|---|---|
| (kHz) | (Multiplies of ωr) | ||
| HP | 13C | 21 | 1.50 |
| 15N | 35 | 2.50 | |
| LP | 13C | 19 | 1.35 |
| 15N | 5 | 0.35 | |
