240 (327) BRUKER BIOSPIN User Manual Version 002
MQ-MAS: Sensitivity Enhancement
Data Processing 18.2.3
Processing parameters should be set according to Table 18.4.. Data obtained
with mp3qdfs.av can be processed with xfb alone, if IN10 or IN11 have been set
appropriately to run a split-t
1
experiment. Since a whole echo is accumulated FT
along F2 from -Δ > t > +Δ is done which necessitates a large 1
st
order phase cor-
rection to compensate for the start of the acquisition before the echo top. This cor-
rection can easily be calculated as given in (Eq. 18.1)and should be stored into
the parameter PHC1. This gives an approximate value, which can be precisely
adjusted in the interactive phase correction routine. The phase of the spectrum
must be corrected such that there is no signal in the imaginary part, as described
above.
Table 18.3. Parameters for 2D Data Acquisition of 4-pulse Z-filtered Experiment mp3qdfsz.av.
Parameter Value Comments
pulprog mp3qdfsz.av
F1 parameters: In eda.
FnMode States or
States-TPPI
Acquisition mode for 2D.
TD see text Number of FID’s to be acquired.
SWH “masr” Equals spinning frequency for rotor synchronization, from this
in0 is calculated correctly, ND_010 must be set first.
NUC1 Select the same nucleus as for F2 so that transmitter frequency
offset is set the same in both dimensions (essential for refer
-
encing).
Pulse program
parameters:
In ased.
D10 0
IN10 =IN0*7/9
0
For spin I=3/2, so that no shearing FT is required.
For all other spin I.
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