Local measure of the electromagnetic field in magnetic resonance coils: How do simulations help to disentangle the contributions of the electric and magnetic fields?

Dillmann, Baudouin; Dubois, Luc; Paleczny, E.; Trébosc, Julien; Amoureux, Jean‐Paul; Pourpoint, Frédérique; Lafon, Olivier

doi:10.1016/j.ssnmr.2016.12.005

Cited by 4 publications

(2 citation statements)

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“…Typically, this amplitude is maximal at the center of the coil and it drops by ca. 50 % near the edges [54][55][56][57]. For SLP, the simulations displayed in Fig.7 show that, independently of the CQ value, (i) the optimal rf-field is equal to ca.…”

Section: Rf-inhomogeneitymentioning

confidence: 92%

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Evaluation of excitation schemes for indirect detection of 14N via solid-state HMQC NMR experiments

Rankin

Trébosc

Paluch

et al. 2019

Journal of Magnetic Resonance

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It has previously been shown that 14 N NMR spectra can be reliably obtained through indirect detection via HMQC experiments. This method exploits the transfer of coherence between single-(SQ) or double-quantum (DQ) 14 N coherences, and SQ coherences of a suitable spin-1/2 'spy' nucleus, e.g., 1 H. It must be noted that SQ-SQ methods require a carefully optimized setup to minimize the broadening related to the first-order quadrupole interaction (i.e., an extremely well-adjusted magic angle and a highly stable spinning speed), whereas DQ-SQ ones do not. In this work, the efficiencies of four 14 N excitation schemes (DANTE, XiX, Hard Pulse (HP), and Selective Long Pulse (SLP)) are compared using J-HMQC based numerical simulations and either SQ-SQ or DQ-SQ 1 H-{ 14 N} D-HMQC experiments on Lhistidine HCl and N-acetyl-L-valine at 18.8 T and 62.5 kHz MAS. The results demonstrate that both DANTE and SLP provide a more efficient 14 N excitation profile than XiX and HP. Furthermore, it is shown that the SLP scheme: (i) is efficient over a large range of quadrupole interaction, (ii) is highly robust to offset and rf-pulse length and amplitude, and (iii) is very simple to set up. These factors make SLP ideally suited to widespread, non-specialist use in solid-state NMR analyses of nitrogen-containing materials.

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Section: Rf-inhomogeneitymentioning

confidence: 92%

“…Typically, this amplitude is maximal at the center of the coil and it drops by ca. 50 % near the edges [54][55][56][57]. For SLP, the simulations displayed in Fig.…”

Section: Rf-inhomogeneitymentioning

confidence: 99%