Bond length measurements in amorphous solids by nutation NMR spectroscopy: The role of rf field homogeneity

Horne, D. E.; Kendrick, R. D.; Yannoni, C. S.

doi:10.1016/0022-2364(83)90198-1

Cited by 16 publications

(15 citation statements)

References 10 publications

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“…In addition, many important biomolecules have low sensitivity due to the small fraction of a mole in the sample. Unfortunately dipolar recoupling methods are also sensitive to rf inhomogeneity as reported previously (11,12). As a result, the observed dipolar coupling is not measured accurately, indeed it is generally underestimated resulting in the determination of longer interatomic distances.…”

Section: Introductionmentioning

confidence: 92%

The Effect of RF Inhomogeneity on Heteronuclear Dipolar Recoupling in Solid State NMR: Practical Performance of SFAM and REDOR

Nishimura

Cross

2001

Journal of Magnetic Resonance

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Section: Introductionmentioning

confidence: 92%

The Effect of RF Inhomogeneity on Heteronuclear Dipolar Recoupling in Solid State NMR: Practical Performance of SFAM and REDOR

Nishimura

Cross

2001

Journal of Magnetic Resonance

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“…The gap between neighboring turns is kept constant and narrow. The coil modifications with improved homogeneity for the radiofrequency B 1 field have been reported (1)(2)(3). The essence advantages of this design are: (a) the narrow gap reduces field variations in the vicinity of the conductor which are of these designs is to correct the inhomogeneity in the axial direction by increasing the density of turns at the coil ends.…”

Section: Design and Constructionmentioning

confidence: 98%

“…The essence advantages of this design are: (a) the narrow gap reduces field variations in the vicinity of the conductor which are of these designs is to correct the inhomogeneity in the axial direction by increasing the density of turns at the coil ends. typical for standard solenoids; this leads to improved homogeneity in the radial direction; (b) variation of the ribbon This can be achieved by adding extra turns (1) or by use of a variable pitch angle (2,3).…”

Section: Design and Constructionmentioning

confidence: 98%

“…A polynomial expansion up to second order was used for the functions h 1 (w) and h 2 (w) (see Eqs. [1] - [3] in the Appendix). The uncoiled ribbon is shown in Fig.…”

Section: Design and Constructionmentioning

confidence: 99%

“…It should be mentioned that optimization of func-ing glue. After the total outer surface of the KEL-F cylinder tion [1] for the entire sample volume yields a value of a was electroplated, unwanted parts of the copper were redifferent from that obtained by optimization of the field moved with a lathe. Finally the resulting surface was polalong the coil z axis.…”

Section: Figmentioning

confidence: 99%

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Coil Design for Large-Volume High-B1Homogeneity for Solid-State NMR Applications

Privalov

Dvinskikh

Vieth

1996

Journal of Magnetic Resonance, Series A

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Rationalising Heteronuclear Decoupling in Refocussing Applications of Solid‐State NMR Spectroscopy

Frantsuzov

Vasa²,

Ernst

et al. 2017

ChemPhysChem

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Factors affecting the performance of 1H heteronuclear decoupling sequences for magic‐angle spinning (MAS) NMR spectroscopy of organic solids are explored, as observed by time constants for the decay of nuclear magnetisation under a spin‐echo (T2' ). By using a common protocol over a wide range of experimental conditions, including very high magnetic fields and very high radio‐frequency (RF) nutation rates, decoupling performance is observed to degrade consistently with increasing magnetic field. Inhomogeneity of the RF field is found to have a significant impact on T2' values, with differences of about 20 % observed between probes with different coil geometries. Increasing RF nutation rates dramatically improve robustness with respect to RF offset, but the performance of phase‐modulated sequences degrades at the very high nutation rates achievable in microcoils as a result of RF transients. The insights gained provide better understanding of the factors limiting decoupling performance under different conditions, and the high values of T2' observed (which generally exceed previous literature values) provide reference points for experiments involving spin magnetisation refocussing, such as 2D correlation spectra and measuring small spin couplings.

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Bond length measurements in amorphous solids by nutation NMR spectroscopy: The role of rf field homogeneity

Cited by 16 publications

References 10 publications

The Effect of RF Inhomogeneity on Heteronuclear Dipolar Recoupling in Solid State NMR: Practical Performance of SFAM and REDOR

The Effect of RF Inhomogeneity on Heteronuclear Dipolar Recoupling in Solid State NMR: Practical Performance of SFAM and REDOR

Coil Design for Large-Volume High-B1Homogeneity for Solid-State NMR Applications

Rationalising Heteronuclear Decoupling in Refocussing Applications of Solid‐State NMR Spectroscopy

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