Cross-polarization with radio-frequency field phase and amplitude modulation under magic-angle spinning conditions

2006 ◽  
Vol 102 (1) ◽  
pp. 91-101 ◽  
Author(s):  
S. V. Dvinskikh ◽  
V. I. Chizhik
Keyword(s):  
Radio Frequency ◽  
Amplitude Modulation ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Cross Polarization ◽  
Field Phase ◽  
Radio Frequency Field ◽  
Frequency Field ◽  
Angle Spinning

Cross-Polarization from Quadrupolar Nuclei to Silicon Using Low-Radio-Frequency Amplitudes during Magic-Angle Spinning

1997 ◽  
Vol 101 (16) ◽  
pp. 3240-3249 ◽  
Author(s):  
Susan M. De Paul ◽  
Matthias Ernst ◽  
Jay S. Shore ◽  
Jonathan F. Stebbins ◽  
Alexander Pines
Keyword(s):  
Radio Frequency ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Quadrupolar Nuclei ◽  
Cross Polarization ◽  
Angle Spinning

scholarly journals Effects of radial radio-frequency field inhomogeneity on MAS solid-state NMR experiments

2021 ◽  
Vol 2 (1) ◽  
pp. 523-543
Author(s):  
Kathrin Aebischer ◽  
Zdeněk Tošner ◽  
Matthias Ernst
Keyword(s):  
Solid State ◽  
Radio Frequency ◽  
Solid State Nmr ◽  
Building Blocks ◽  
Magic Angle Spinning ◽  
Time Dependent ◽  
Magic Angle ◽  
Field Inhomogeneity ◽  
Radio Frequency Field ◽  
Frequency Field

Abstract. Radio-frequency field inhomogeneity is one of the most common imperfections in NMR experiments. They can lead to imperfect flip angles of applied radio-frequency (rf) pulses or to a mismatch of resonance conditions, resulting in artefacts or degraded performance of experiments. In solid-state NMR under magic angle spinning (MAS), the radial component becomes time-dependent because the rf irradiation amplitude and phase is modulated with integer multiples of the spinning frequency. We analyse the influence of such time-dependent MAS-modulated rf fields on the performance of some commonly used building blocks of solid-state NMR experiments. This analysis is based on analytical Floquet calculations and numerical simulations, taking into account the time dependence of the rf field. We find that, compared to the static part of the rf field inhomogeneity, such time-dependent modulations play a very minor role in the performance degradation of the investigated typical solid-state NMR experiments.

scholarly journals Effects of radial radio-frequency field inhomogeneity on MAS solid-state NMR experiments

2021 ◽  
Author(s):  
Kathrin Aebischer ◽  
Zdeněk Tošner ◽  
Matthias Ernst
Keyword(s):  
Solid State ◽  
Radio Frequency ◽  
Solid State Nmr ◽  
Building Blocks ◽  
Magic Angle Spinning ◽  
Time Dependent ◽  
Magic Angle ◽  
Field Inhomogeneity ◽  
Radio Frequency Field ◽  
Frequency Field

Abstract. Radio-frequency field inhomogeneity is one of the most common imperfections in NMR experiments. They can lead to imperfect flip angles of applied radio-frequency (rf) pulses or to a mismatch of resonance conditions resulting in artifacts or degraded performance of experiments. In solid-state NMR under magic-angle spinning, the radial component becomes time-dependent because the rf-irradiation amplitude and phase is modulated with integer multiples of the spinning frequency. We analyze the influence of such time-dependent MAS-modulated rf fields on the performance of some commonly used building blocks of solid-state NMR experiments. This analysis is based on analytical Floquet calculations as well as numerical simulations taking into account the time dependence of the rf field. We find that compared to the static part of the rf-field inhomogeneity, such time-dependent modulations play a very minor role in the performance degradation of the investigated typical solid-state NMR experiments.

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