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. Author manuscript; available in PMC: 2021 Jul 30.
Published in final edited form as: J Phys Chem B. 2020 Aug 6;124(33):7138–7151. doi: 10.1021/acs.jpcb.0c04574

Figure 8.

Figure 8.

Measured, simulated, and calculated PERSPIRATIONCP polarization transfer efficiencies as a function of the 13C rf carrier frequency and pulse flip angle. The experiments were conducted on an 800 MHz spectrometer under 20 kHz MAS. Calculations were conducted for the same conditions. (a) Measured PERSPIRATIONCP efficiencies of f-MLF as a function of 13C carrier frequency and 13C pulse flip angle. The 2D heat map is generated from 25 × 80 1D spectra measured as a function of 13C pulsed flip angles (0˚ to 360˚ in 15˚ increments) and rf carrier frequencies (0 to 200 ppm in 2.5 ppm increments.) The integrated Cα band intensities (46 ppm to 59 ppm) of the spectra are represented in the plot. The rf field strengths of the PERSPIRATIONCP block are 57 kHz, 47 kHz, and 36 kHz for 1H, 13C and 15N, respectively. (b) Numerical simulations of PERSPIRATIONCP polarization transfer from an on-resonance 15N to 13Cα. (c) PERSPIRATIONCP transfer efficiencies calculated using the analytical model.