Search for a Magnetic-Field Dependence of the Interaction of the Nuclear Quadrupole Moment with the Electric-Field Gradient

Filsinger, B.; Gutsche, Peter; Haeberlen, Ulrich; Weiden, Norbert

doi:10.1006/jmre.1997.1108

Cited by 18 publications

(14 citation statements)

References 14 publications

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“…1 ; however, this discrepancy may be explained by the finite pulse length and/or the quality factor of the probe. We also observe a doublet-like lineshape for each transition, which is attributed to 27 Al- 27 Al homonuclear dipolar coupling (27,28). Shown in Fig.…”

Section: Population Transfermentioning

confidence: 81%

“…The numbers beside the arrows indicate idealized relative intensities observed for the central transition. 27 Al NMR spectra of a single crystal of ␣-Al 2 O 3 acquired at B 0 ϭ 7.05 T with (a, c, and e) a "hard" nonselective pulse (␥B 1 /2 ϭ 100 kHz) and (b, d, and f) a "soft" selective /2 pulse (␥B 1 /2 ϭ 10 kHz) with (c and d) inversion of the populations of the Ϯ3/2 7 Ϯ1/2 transitions only and with (e and f) inversion of the populations of the Ϯ5/2 7 Ϯ3/2 transitions followed by the inversion of the populations of the Ϯ3/2 7 Ϯ1/2 transitions. The enhancement factors for b, d, and f are indicated on the right.…”

Section: Population Transfermentioning

confidence: 97%

“…Using 27 Al NMR, we illustrate the enhancements obtained from various population transfer experiments. Shown in Fig.…”

Section: Population Transfermentioning

confidence: 98%

“…Shown in Fig. 3(c) and (d) are the 27 Al NMR spectra obtained after inverting the populations of the energy levels associated with the 3/2 7 1/2 and Ϫ1/2 7 Ϫ3/2 transitions. A signal enhancement of 2.9 is observed for the central transition after applying a selective /2 pulse [cf.…”

Section: Population Transfermentioning

confidence: 98%

“…Shown in Fig. 3 (27,28), using a nonselective pulse (␥B 1 /2 ϭ 100 kHz) and a selective /2 pulse (␥B 1 /2 ϭ 10 kHz), respectively. The relative intensities of the peaks in with saturation of all the satellite energy levels above m I ϭ 1/2 and below m I ϭ Ϫ1/2, (c) inversion of the populations of the Ϯ5/2 with the Ϯ3/2 energy levels followed by an inversion of the populations of the Ϯ3/2 with the Ϯ1/2 energy levels, and (d) inversion of the populations of the Ϯ3/2 with the Ϯ1/2 energy levels first, followed by inversion of the Ϯ5/2 and Ϯ3/2 energy levels.…”

Section: Population Transfermentioning

confidence: 99%

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Sensitivity enhancement of NMR spectra of half-integer quadrupolar nuclei in the solid state via population transfer

Siegel

Nakashima

Wasylishen

2005

Concepts Magn. Reson.

103

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Three population transfer techniques for improving the sensitivity of the central transition of NMR spectra from half-integer quadrupolar nuclei in the solid state are described. Two of the methods attempt to invert the populations of energy levels associated with the satellite transitions either by employing double frequency sweeps (DFS) or hyperbolic secant (HS) pulses. The third method, rotor-assisted population transfer (RAPT), is designed to saturate the satellite transitions. The effect of various experimental parameters on the resulting sensitivity enhancement is discussed. We trust that novice solid-state NMR spectroscopists interested in acquiring NMR spectra of half-integer spin quadrupolar nuclei will find these notes helpful.

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Section: Population Transfermentioning

confidence: 81%

Section: Population Transfermentioning

confidence: 97%

“…Using 27 Al NMR, we illustrate the enhancements obtained from various population transfer experiments. Shown in Fig.…”

Section: Population Transfermentioning

confidence: 98%

Section: Population Transfermentioning

confidence: 98%

Section: Population Transfermentioning

confidence: 99%

See 3 more Smart Citations

Sensitivity enhancement of NMR spectra of half-integer quadrupolar nuclei in the solid state via population transfer

Siegel

Nakashima

Wasylishen

2005

Concepts Magn. Reson.

103

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Solid‐state NMR Spectroscopy of Quadrupolar Nuclei in Inorganic Chemistry

Bräuniger

Jansen

2013

Zeitschrift anorg allge chemie

104

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We here review the principles and applications of solid‐state NMR spectroscopy of quadrupolar nuclei, with a special emphasis on structural studies of inorganic solids. Most NMR‐observable nuclei have spin I > 1/2, and possess a quadrupole moment. The resulting quadrupolar interaction severely broadens the resonances, but also encapsulates valuable information about the symmetry of the electronic surroundings of the observed nucleus. The effect of the quadrupolar interaction, as well as that of the chemical shift and dipolar interaction, on solid‐state NMR spectra is examined in this article. To regain good resolution, specifically designed NMR techniques exist to remove the quadrupolar broadening, i.e. overtone and MQMAS spectroscopy, the principles of which are outlined here. In addition, the possibility of distance measurements via the dipolar interaction using the REDOR technique is discussed. The combined information derived from distance measurements, quadrupolar and chemical shift parameters can be helpful for determination of the crystal structure, or for detection of impurity phases, as illustrated by surveying a number of case studies covering spin I = 1, 3/2, 5/2 and 7/2.

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NQRS Data for Al2O3 (Subst. No. 0064)

Chihara¹,

Nakamura²

2010

Landolt-Börnstein - Group III Condensed Matter

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Search for a Magnetic-Field Dependence of the Interaction of the Nuclear Quadrupole Moment with the Electric-Field Gradient

Cited by 18 publications

References 14 publications

Sensitivity enhancement of NMR spectra of half-integer quadrupolar nuclei in the solid state via population transfer

Sensitivity enhancement of NMR spectra of half-integer quadrupolar nuclei in the solid state via population transfer

Solid‐state NMR Spectroscopy of Quadrupolar Nuclei in Inorganic Chemistry

NQRS Data for Al2O3 (Subst. No. 0064)

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