Fig. 1 Nuclear magnetic resonance (NMR) pulse sequences used in this work. (a): direct-polarization magic-angle spinning (DPMAS) (b) cross-polarization spin-lattice relaxation time (CP/T1)–total sideband suppression (TOSS)
Fig. 1 Nuclear magnetic resonance (NMR) pulse sequences used in this work. (a): direct-polarization magic-angle spinning (DPMAS) (b) cross-polarization spin-lattice relaxation time (CP/T1)–total sideband suppression (TOSS)