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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: J Magn Reson. 2011 Nov 2;214(1):81–90. doi: 10.1016/j.jmr.2011.10.012

Figure 11.

Figure 11

Simulated NCA and NCO transfer efficiencies for EXPORT as a function of pulse interval. The results were calculated for two-spin systems at 700 MHz for 1H and with νr= 14 kHz. The number of times the EXPORT block was repeated was optimized for each pulse interval. The left-hand graphs show results for the C/2π=3νr condition, which is the condition used for the experimental results in this paper. The right-hand graphs correspond to the C/2π=7νr condition, in which the average RF field strength is approximately seven times the spinning frequency. The gray vertical line indicates the smallest available pulse intervals (350 ns) for “fast” shaped pulses on our Bruker spectrometers; newer models are able to use significantly smaller pulse intervals.