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. Author manuscript; available in PMC: 2016 Mar 1.
Published in final edited form as: J Magn Reson. 2015 Jan 6;252:55–66. doi: 10.1016/j.jmr.2014.12.010

Figure 3.

Figure 3

The dependence of the longitudinal proton magnetization build-up rate in a three-proton spin system against the duty factor of the fp-RFDR pulse sequence, f=τ180/ τR, at 60 kHz MAS for different phase cycling schemes. The buildup rate is defined as the inverse of mixing time needed for the transferred magnetization intensity to reach the maximum. In the simulations using SIMPSON, a three spin ½ system was considered with 1 kHz (A) and 5 kHz (B) homonuclear dipolar couplings. The final equilibrated magnetization intensity, obtained at a mixing time of 100 ms, as a function of fp-RFDR duty factor for a homonuclear dipolar coupling of 1 (C), 10 (D), 20 (E) and 29.3 kHz (F). The duty factor was adjusted by changing the RF field strength used for the 180° pulse in the fp-RFDR pulse sequence.