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. Author manuscript; available in PMC: 2016 Jan 1.
Published in final edited form as: J Magn Reson. 2014 Nov 15;250:37–44. doi: 10.1016/j.jmr.2014.10.013

Figure 5.

Figure 5

(A) 13C-detected 2D CPVC SLF spectrum of a uniformly-13C-labelled isoleucine powder sample obtained at 60 kHz MAS. 1H-13C dipolar splitting spectra for the CHα group extracted from 2D CPVC SLF spectra obtained under various conditions: with the 13C carrier frequency set at the 13Cc resonance position (B) and 10 kHz offset below the 13Cαresonance frequency (C, D, E). For (B, C, D), constant amplitude spin-locks were used for Hartmann-Hahn CP, while for (E) a ramped-CP was used with a 15% ramp size on the 13C spin-lock. For the ramped-CP, the ramp ratio is defined as (whighest-wlowest)/(whighest+wlowest).