Figure 4.

Simulated and experimental NCA and NCO transfer efficiencies for adiabatic DCP, ^OCDCP, and EXPORT as a function of pulse length at 700 MHz for ¹H and with ν_r=14 kHz. The blue lines (or blue triangles) represent simulation results and the red circles represent experimental results. As ^OCDCP pulses cannot be varied in length, a number of different pulses with pulse lengths between 1.5 and 4 ms were calculated and then simulated (blue triangles). The simulations used a ¹³C-¹⁵N two-spin system and a 8% gaussian RF inhomogeneity profile. The experimental results were acquired using a [U-¹³C, U-¹⁵N] SH3 sample and were measured relative to ¹³C CP-MAS spectra that were optimized for transfer to C_α or Co.