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. Author manuscript; available in PMC: 2019 Aug 10.
Published in final edited form as: J Phys Chem B. 2019 Apr 1;123(14):3061–3067. doi: 10.1021/acs.jpcb.9b02277

Figure 3:

Figure 3:

Experimental and fit Isotropic projections of 17O 2D MQMAS spectra at (a) 35.2 T (ω0H/2π = 1500 MHz) and (b) 18.8 T (ω0H/2π = 800 MHz). Four distinct water environments are resolved with isotropic frequencies of (a) 0.4 ± 1, 3.1 ± 1, 5.6 ± 1, and 7.8 ± 1 ppm and (b) 13.1 ± 1, 16.0 ± 1, 17.1 ± 1, and 19.9 ± 1 ppm. The Lorenztian fits of each environment indicate a ratio of populations of 1:1:1:1.