Bruker BioSpin Solid State NMR - Figure 18.3. Four Pulse Sequence and Coherence Transfer Pathway for the 3 Q MAS Experiment; Figure 18.4. Three Pulse Sequence and Coherence Transfer Pathway

234 (327) BRUKER BIOSPIN User Manual Version 002
MQ-MAS: Sensitivity Enhancement
Figure 18.3. Four Pulse Sequence and Coherence Transfer Pathway for the 3Q
MAS Experiment
Four pulse sequence and coherence transfer pathway for the 3Q MAS experiment
with z-filter (mp3dfsz.av) and double frequency sweep (DFS). Excitation pulse p1
and selective pulses P3 are the same as for mp3qzfil.av. Delays D0 and D4 are
the incremented delay for t
1
evolution and 20 µs for z-filter, respectively. Delay
D10 can be incremented for spin I = 3/2 nuclei proportional to D0. Power level and
duration of the sweep P2 must be optimized. Phase lists are as follows, for phase
sensitive detection in F1 the phase of the first pulse must be incremented by 30°
in States or States-TPPI mode:
ph1 = 0 60 120 180 240 300
ph2 = 0*24 90*24 180*24 270*24
ph3 = 0
ph4 = 0*6 90*6 180*6 270*6
receiver = {0 180}*3 {90 270}*3 {180 0}*3 {270 90}*3
{180 0}*3 {270 90}*3 {0 180}*3 {90 270}*3.
Figure 18.4. Three Pulse Sequence and Coherence Transfer Pathway