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. Author manuscript; available in PMC: 2018 Feb 27.
Published in final edited form as: Acc Chem Res. 2017 Mar 29;50(4):1105–1113. doi: 10.1021/acs.accounts.7b00082

Figure 4.

Figure 4

Measurement of proton–proton distances under ultrafast MAS. (A) RF pulse sequence for selective detection of proton resonances and 1H–1H distance measurements. (B) Decay of H5 peak intensity and intensity buildup of H8 and H9 peaks as a function of fp-RFDR mixing time following the selective excitation of the H5 peak in L-histidine·HCl·H2O. The contact time for the first CP is 2 ms, while it is 100 μs for the second CP. (C) Simulated build-up rate (R) as a function of the 1H–1H dipolar couplings (DHH) in a two-spin system. The 1H 90° pulse was 1.4 μs, and the MAS frequency was 60 kHz. Reprinted from ref 41, with the permission of AIP Publishing.