On the origin of spinning sidebands in MQMAS NMR experiments

Marinelli, Laura; Frydman, Lucio

doi:10.1016/s0009-2614(97)00746-x

Cited by 53 publications

(40 citation statements)

References 26 publications

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“…However, the spectral changes in the nonsynchronous experiments, as shown in Fig. 5, can cause an increase in the MQMAS sideband intensities [34].…”

Section: Analysis Of Anisotropic Lineshapesmentioning

confidence: 97%

The Influence of the Radiofrequency Excitation and Conversion Pulses on the Lineshapes and Intensities of the Triple-Quantum MAS NMR Spectra of I=3/2 Nuclei

Goldbourt

Kababya

Vega

et al. 2000

Solid State Nuclear Magnetic Resonance

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“…However, the spectral changes in the nonsynchronous experiments, as shown in Fig. 5, can cause an increase in the MQMAS sideband intensities [34].…”

Section: Analysis Of Anisotropic Lineshapesmentioning

confidence: 97%

The Influence of the Radiofrequency Excitation and Conversion Pulses on the Lineshapes and Intensities of the Triple-Quantum MAS NMR Spectra of I=3/2 Nuclei

Goldbourt

Kababya

Vega

et al. 2000

Solid State Nuclear Magnetic Resonance

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“…5 we present the 3Q-MAS spectrum recorded at 7.0 T, acquired with a spectral width of 100 kHz in the indirect dimension. The spinning sidebands in the isotropic dimension can arise both from the interplay of first-order quadrupolar interaction and pulses 26 and from chemical shift anisotropy that is tripled in the indirect triple quantum dimension (and is not modified by the shearing transformation). These sidebands intensities appear to be site dependent [ Fig.…”

Section: Resultsmentioning

confidence: 99%

17O NMR in room temperature phase of La2Mo2O9 fast oxide ionic conductor

et al. 2005

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A room temperature (17)O NMR study of La(2)Mo(2)O(9), a fast oxide ionic conductor exhibiting a phase transition at 580 degrees C between a low-temperature alpha-phase and a high-temperature beta-phase, is presented. Four partly overlapping quasi-continuous distributions of oxygen sites are evidenced from 1D magic angle spinning (MAS) and 2D triple quantum MAS NMR experiments. They can be correlated with the three oxygen sites O1, O2 and O3 of the high-temperature crystal structure. The low-temperature phase is characterized by two distributed sites of type O1, which proves that the symmetry is lower than in the cubic high-temperature phase. Two-dimensional experiments show that there is no dynamic exchange process, on the NMR time-scale, between the different oxygen sites at room temperature, which agrees well with conductivity results.

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“…4b contains numerous spinning sidebands. Spinning sidebands are often observed in the isotropic dimensions of MQMAS spectra and result from two different mechanisms [39,46,66,[71][72][73][74][75][76]: (1) from the rotor modulation of the anisotropic chemical shift, quadrupolar, and/or dipolar interactions; this is the same mechanism that produces spinning sidebands in MAS spectra; (2) from the rotor modulation of the conversion period being different than that of the excitation period by a phase factor which depends on the duration of t 1 .…”

Section: Resultsmentioning

confidence: 99%