STMAS
User Manual Version 002 BRUKER BIOSPIN 253 (327)
Data Processing 19.4
Processing parameters should be set according to the table below:
Data obtained with stmasdqfe.av can be processed with xfb only, if IN6 or IN7
have been set appropriately to run a split-t
1
experiment. Data acquired with the
pulse program stmasdqfz.av should be processed with the AU program xfshear.
For information about this program please refer to chapter 16. In an analogous
way to MQMAS spectra the apparent Larmor frequency in the indirect dimension
is recalculated by multiplying the real Larmor frequency with the corresponding
value of ⎜R-p ⎜. The values for the different spin quantum numbers are summa
-
rized in Table 19.7., for experiments using the inner ST (± 3/2 ↔ ± 1/2). R deter-
mines the shearing ratio, i.e. the slope in a non-sheared spectrum, ⎜R-p ⎜ is the
scaling factor for referencing in the indirect dimension. Using this procedure the
shift positions in the indirect dimension are identical (in ppm) to all MQMAS exper
-
iments, and the information obtained is the same.
Table 19.6. Processing Parameters for the 2DFT
Parameter Value Comments
F2 (acquisition dimension)
SI Usually set to one times zero filling.
WDW No Don’t use window function.
PH_mod Pk Apply phase correction.
BC_mod No No DC correction is required after full phase cycle.
ABSF1 1000 ppm Should be outside the observed spectral width.
ABSF2 -1000 ppm Should be outside the observed spectral width.
STSR 0 Avoid strip FT.
STSI 0 Avoid strip FT.
TDoff 0 Avoid left shifts or right shifts before FT.
F1 (indirect dimension)
SI 256 Sufficient in most cases.
WDW no Don’t use window function, unless F1 FID is truncated.
PH_mod pk Apply phase correction.
BC_mod no No DC correction is required after full phase cycle.
ABSF1 1000 Should be outside the observed spectral width.
ABSF2 -1000 Should be outside the observed spectral width.
STSR 0 Avoid strip FT.
STSI 0 Avoid strip FT.
TDoff 0 Avoid left shifts or right shifts before FT.
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