Bruker BioSpin Solid State NMR - Figure 5.5. Shape with Phase Gradients; Table 5.2. Processing Parameters; Table 7.1. Acquisition Parameters

96 (327) BRUKER BIOSPIN User Manual Version 002
Decoupling Techniques
As mentioned above, frequency shifts can also be generated by a phase gradient
shape. A phase change of 360° per second corresponds to a frequency of 1 Hz,
as can easily be visualized. The frequency shift which needs to be achieved is
±RF-field/
. Since the pulse duration must achieve a 2 rotation off resonance,
corresponding to a 293° flip angle on resonance, it can easily be calculated that a
phase change over 209° during a 293° flip angle pulse is required to achieve this.
Figure 5.5. Shape with Phase Gradients
In the figure above: Shape with phase gradients for positive and negative offsets
and corresponding phase change, stdisp –display of lgs-1 shape. Amplitude is
100% throughout.
cnst24 0 To be optimized.
cnst21 0 Reset proton frequency to SFO2.
Table 5.2. Processing Parameters
Parameter Value Comment
SI 2*td Adequate 4fold zero filling.
WDW no No apodization.
PH_mod pk Phase correction if needed.
BC_mod quad DC offset correction.
Table 5.1. Acquisition Parameters
2
π