MQ-MAS: Sensitivity Enhancement
User Manual Version 002 BRUKER BIOSPIN 241 (327)
Data obtained with mp3qdfsz.av can be processed with the AU program xfshear,
unless in case of nuclei with spin I = 3/2 where a straight 2D FT can be used if a
split-t
1
experiment has been recorded by setting IN10 appropriately. The informa-
tion obtained from the DFS enhanced spectra is the same as from the standard
MQMAS experiments. Please refer to the chapter
"Basic MQ-MAS" on page 213
for further details regarding the shearing transformation and the information ob-
tained from MQMAS spectra.
Table 18.4. Processing Parameters
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
QSINE
Don’t use window function.
Only use if FID in F1 is truncated.
SSB 2 π/2 shifted squared sine bell.
PH_mod pk Apply phase correction.
PHC1 −(d6/dw)*180.
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.
To Next Page
Loading...