Bruker BioSpin Solid State NMR, User Manual

Page: 293 / 328

CRAMPS 2D
User Manual Version 002 BRUKER BIOSPIN 293 (327)
Data Processing 24.3
The spectral width in both dimensions assumes the absence of shift scaling. In or-
der to account for the shift scaling effect of the sequence, one has to increase the
spectral width by the scaling factor. Before doing the 2D-fourier transformation,
type
s sw
to call the status parameters for both F2 and F1 and replace both val-
ues by <current value>/0.6. After
xfb
, the relative peak positions will be (approxi-
mately) correct, but the absolute peak positions must be corrected by calibrating a
known peak position to the correct value. The pulse program is written such that
the correctly scaled sweep widths are calculated and indicated upon
ased
. These
values are set as status parameters before transform as indicated above.
sw, swh along F1 Same as for F2. Needs to be corrected before transform pulse pro-
gram calculates approximate values to be set
before transform (
ased
).
td 512-1k. Depending on resolution.
1 td 128-256. Depending on resolution.
spnam1 wpmlg1, m5m or m5p as
in 1d. DUMBO may be used with modified timing.
spnam2 lgs-2 or lgs-4 if used. Set l3=2 or 4, depending on desired sw1 DUMBER-
22 with modified timing.
Table 24.2. Phases, RF-levels, and Timings
Phases RF Power Levels Timing
φ
0
=
0, STATES-TPPI pl12 = set for around 100 kHz p1 around 2.5 µsec.
φ
1
=
CYCLOPS, 1 2 3 0 pl12 p1
φ
5
=
2
φ
10
=
0 2
sp1,sp2: set for 100-130 kHz RF-
field or pl13 for both set in ppg WPMLG: calculated via cnst20.
DUMBO: p10 set by xau dumbo.
φ
11
=
0 2
dto. dto.
φ
31
=
CYCLOPS, 0 1 2 3 d8 = desired mixing time, 50-1000
µs.
Table 24.3. Processing Parameters
Parameter Value Comment
mc2
STATES-TPPI
wdw
QSINE Slight-moderate resolution enhancement is usually required.
Table 24.1. Acquisition Parameters