Dipolar Spectroscopy: Transient Nutations and Other Techniques

Engelsberg, M.

doi:10.1002/9780470034590.emrstm0126

Encyclopedia of Magnetic Resonance 2007

DOI: 10.1002/9780470034590.emrstm0126

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Dipolar Spectroscopy: Transient Nutations and Other Techniques

M. Engelsberg

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“…prior to Fourier transformation. In the case of an isolated pair of spins, a Pake powder pattern devoid of heteronuclear dipolar coupling, chemical shift anisotropy, and broadening due to magnetic field inhomogeneity is obtained (44,45).…”

mentioning

confidence: 99%

Signal-to-noise enhancement of NMR spectra of solids using multiple-pulse spin-echo experiments

Siegel

Nakashima

Wasylishen

2005

Concepts Magn. Reson.

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Three multiple-pulse spin-echo experiments that have been used to enhance the sensitivity of broad powder patterns obtained from NMR spectra of spin-1/2 and half-integer quadrupolar nuclei in polycrystalline solids are examined. Specifically, the Carr-Purcell Meiboom-Gill (CPMG), the Mansfield-Waugh (MW-4), and a modified version of the CPMG experiment (modified-CPMG) are described and compared. Use of these pulse sequences results in transforming the broad powder lineshapes into a series of narrow spikelets whose overall envelope mimics that obtained from the normal Hahn-echo experiment. The CPMG and modified-CPMG methods can result in a considerable saving in experiment time and are particularly powerful in studying the central transition of halfinteger spin quadrupolar nuclei. Artifacts generated by the MW-4 sequence or caused by imperfections in the pulses in the CPMG sequences are explained using a product operator analysis.

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mentioning

confidence: 99%

Signal-to-noise enhancement of NMR spectra of solids using multiple-pulse spin-echo experiments

Siegel

Nakashima

Wasylishen

2005

Concepts Magn. Reson.

View full text Add to dashboard Cite

show abstract

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Dipolar Spectroscopy: Transient Nutations and Other Techniques

Cited by 1 publication

References 13 publications

Signal-to-noise enhancement of NMR spectra of solids using multiple-pulse spin-echo experiments

Signal-to-noise enhancement of NMR spectra of solids using multiple-pulse spin-echo experiments

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