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3.8
ADJUSTMENT OF DECOUPLING CONDITIONS
For a sample containing
2.3). Since very strong RF pulses are used for high-power decoupling, it is necessary to
decrease the decoupling power in the measurements in which the data acquisition time
x_acq_time is 100 ms or more.
3.8.1
Setting of CW (Continuous Wave) Decoupling Conditions
In the solid-state NMR, since very strong RF pulses are applied in comparison with the
solution NMR, RF power is applied only during data acquisition.
When the data acquisition time is about 100 ms or less, you can use the value of
irr_amp_dec at 100% (the maximum power which can be used in the equipment). When
the data acquisition time is longer, you need to lower the value of irr_amp_dec and
measure.
3.8.2
Setting of TPPM Decoupling Conditions
In the decoupling of TPPM (Two Pulse Phase Modulation), adjust the pulse width
irr_pwidth and phase shift value irr_tppm_shift.
1.
Set the standard sample glycine.
2.
Set irr_noise to TPPM.
3.
Perform the array measurement for irr_ width_tppm and irr_phs_tppm.
4.
Click the Submit button.
The pulses occur, and the measurement starts.
When the measurement ends, the nD Processor window automatically opens.
5.
Perform data processing.
Take a slice of C
6.
7.
Obtain the values of irr_ width_tppm and irr_phs_tppm with the strongest
signal intensity in the two-dimensional data of the YZ plane.
NMECAXS_V50-SLD-2
H, it is necessary to perform high-power decoupling (
1
Please refer to the user's manual "Data processing" for information on proc-
essing the data obtained by the array measurement.
carbon in the 3D processed spectrum.
α
3 SETTING OF INSTRUMENT CONDITIONS
Sect.
3-13
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