Bruker BioSpin Solid State NMR, User Manual

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Relaxation Measurements
User Manual Version 002 BRUKER BIOSPIN 205 (327)
Data Processing 16.2.3
Once the pseudo-2D data has been recorded, the processing parameters must be
set and checked before it can be evaluated using the T
1
/T
2
relaxation tool.
Table
16.3.
lists the relevant parameters. No processing is done in the indirect dimen-
sion (the relaxation dimension), but the size must still be set to a power of two for
TOPSPIN to create a processed data file. The size should be next power of two
larger than the number of relaxation delays used. The zero points appended are
ignored by the relaxation analysis. In principle the line shape in the frequency di-
mension does not affect the analysis, so exponential multiplication with
lb
of the
order of the observed line width can be applied to improve the signal-to-noise ra-
tio.
Table 16.2. Parameters for 2D Inversion Recovery Experiment
Parameter Value Comments
Parmode 2D
Vdlist See text
td(f1) Number of entries in vd list
FnMODE QF This is not a real 2D experiment.
NS 4, for the glycine sample Sample dependent – need to see a reasonable
spectrum, but must be an even number.
Table 16.3. Processing Parameters for CP T1 Relaxation Experiment
Parameter Value Comment
F2 – acquisition dimension
SI =TD Zero fill.
LB Matched to line width.
WDW EM
Ft_mod FQC
ABSF1 1000 Limits for baseline correction.
ABSF2 -1000 Should cover entire F2 width.
F1 – relaxation dimension
SI Smallest power of 2 greater than
TD(F1) Must be 2n, but any zeros will be
ignored.