Bruker BioSpin Solid State NMR, User Manual

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214 (327) BRUKER BIOSPIN User Manual Version 002
Basic MQ-MAS
Figure 17.1. A 3-Pulse Basic Sequence with Z-Filter.
Three pulse sequence and coherence transfer pathway for the 3Q MAS experi-
ment with z-filter (mp3qzqf.av). The ratio for pulses p1 and p2 is approximately 3.
The corresponding power level pl11 should be set to achieve at least 150 kHz RF
field amplitude. p3 should be some tens of µs, corresponding to an RF field ampli-
tude of a few kHz. Delays d0 and d4 are the incremented delay for t1 evolution
and 20 µs for z-filter, respectively. 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
ph2 = 0 0 60 60 120 120 180 180 240 240 300 300
ph3 = 0 180
receiver = + – – +.
Figure 17.2. A 4-Pulse Basic Sequence with Z-Filter.
Four pulse sequence and coherence transfer pathway for the 3Q MAS experiment
with z-filter (mp3qzfil.av). p1 is the same, p2 is usually somewhat shorter than in
the three pulse sequence. Corresponding power level pl11 should be set to
achieve at least 150 kHz RF field amplitude. p3 should be some tens of µs, corre-