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Here, νR is the sample spinning frequency.
It is noticed that increasing the spinning frequency enhances this difference.
The effect of the spinning frequency on the magnetic features is discussed.
Increasing the spinning frequency increases the weight of the low coercive field component.
A spinning frequency of 10 kHz was used for MAS, residual spinning side bands are marked with, and peaks from potassium bitartrate with (K).
The following experimental parameters were used: 4.0 KHz spinning frequency, 45o pulse width of 2.4 ls, 30 s recycle delay, and 360 scans.
Similar(32)
The modified sequence is compared with the established TPPM sequence and a variety of other decoupling sequences at low to moderate magic-angle spinning frequencies.
The observations from simulations are corroborated with experimental findings at two spinning frequencies on U 13C-glycine and U 13C-glycinedine.HCl.H2O.
Using this cryostat to cool a closed-loop of helium gas brings the additional advantage of sample spinning frequencies that can greatly surpass those achievable with nitrogen gas, due to the differing fluidic properties of these two gases.
The line broadening can be reduced significantly (resulting in high-resolution solid-state 13C NMR spectra) by a combination of MAS, typically at spinning frequencies of around 10 kHz, and high-power 1H decoupling.
Spinning frequencies of 5 kHz were controlled by a Varian pneumatic system that ensures a rotation stability of about 2 Hz.
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