2015
DOI: 10.1039/c4cp03994g
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14N overtone NMR under MAS: signal enhancement using symmetry-based sequences and novel simulation strategies

Abstract: Overtone 14N NMR spectroscopy is a promising route for the direct detection of 14N signals with good spectral resolution.

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Cited by 33 publications
(40 citation statements)
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“…Globally, the 'on-resonance' sensitivity largely increases with the magnetic field in case of 1 Fig.3 in ref. [17]). Another limitation for the use of high magnetic fields may stem from the limited excitation bandwidths of these sequences, particularly the 1 H-{ 14 N DQ OT } experiment (see section IV.d).…”
Section: Methodsmentioning
confidence: 93%
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“…Globally, the 'on-resonance' sensitivity largely increases with the magnetic field in case of 1 Fig.3 in ref. [17]). Another limitation for the use of high magnetic fields may stem from the limited excitation bandwidths of these sequences, particularly the 1 H-{ 14 N DQ OT } experiment (see section IV.d).…”
Section: Methodsmentioning
confidence: 93%
“…16a Therefore, polarization transfers, including 1 H → 14 N cross-polarization and Dynamic Nuclear Polarization, have been employed to enhance the sensitivity of this technique under static 15 and MAS conditions. 17,18 We have chosen to use WURST pulses herein because they achieve more uniform broadband excitation than other frequency-swept pulse shapes, such as hyperbolic secant. The 14 N DQ transition can also be observed indirectly using 2D hetero-nuclear correlation experiments, such as HMQC and HSQC.…”
mentioning
confidence: 99%
“…The methods used to perform such simulations in reasonable time are described in our previous paper 24 and implemented in Spinach. The methods used to perform such simulations in reasonable time are described in our previous paper 24 and implemented in Spinach.…”
Section: Theorymentioning
confidence: 99%
“…[15][16][17][18][19][20][21][22][23][24] Overtone NMR spectroscopy is advantageous because the width of the 14 N overtone powder pattern is unaffected, to first order in perturbation theory, by the quadrupolar interaction. 17,24 However, even under MAS, the overtone powder line is still in the kHz range, due to the presence of quadrupolar interaction terms of the spherical rank higher than 2 in the effective Hamiltonian. [21][22][23]25 More recently, 14 N overtone spectra acquired under magic-angle spinning (MAS) have been reported, demonstrating the existence of only five 14 N spinning sidebands.…”
Section: Introductionmentioning
confidence: 99%
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