MQ-MAS: Sensitivity Enhancement
User Manual Version 002 BRUKER BIOSPIN 243 (327)
Figure 18.7. Pulse Sequence and Coherence Transfer Pathways for SPAM
3QMAS.
It is extremely convenient that the setup of the pulse lengths and power levels can
be done with the pulse program mp3qzqf.av. The setup procedure is exactly the
same as described for this experiment in the chapter
"Basic MQ-MAS" on page
213. Before the start of the 2D data acquisition all that needs to be set is the pulse
program, mp3qspam.av, and a small number of other parameters. These are list-
ed in Table 18.6.:
Table 18.6. Further Parameters for 2D Data Acquisition of SPAM MQMAS Experiment mp3qspam.av
Parameter Value Comments
pulprog mp3qspam.av
Further F1 parameters: In eda.
FnMode Echo/Anti-echo Acquisition mode for 2D.
Further pulse program
parameters:
In ased.
D4 0.5 µs Not 20 µs like in mp3qzqf.av.
l4 1 Set by the pulse program, internally used counter.
l5 see text Number of anti-echos to be acquired 0 > L5 > td{F1}/2.
l6 3
1
For spin I = 3/2.
For all other spins.
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