Multipole N.M.R.

Sanctuary, B. C.; Halstead, T. K.; Osment, P.A

doi:10.1080/00268978300101531

Cited by 84 publications

(18 citation statements)

References 24 publications

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“…In summary, the expected consequences of quadrupole perturbation on the NMR signals are as follows: (i) intensity reduction and broadening of NMR spectrum (the narrowing of the time-domain free induction decay (FID) and echo signals), (ii) shortening of the "rr/2" pulse length compared to a spin system experiencing no quadrupole splitting when applying single-pulse irradiation [8], and (iii) the appearance of "quadrupole echoes" following two-pulse irradiation [2][3][4][5][6][7]10].…”

Section: Introduction and Backgroundsmentioning

confidence: 99%

“…Additional systematic experimental results are reported on polycrystalline copper anda copper-based dilute alloy. Quadrupole echoes [2][3][4][5][6]10] and the shortening of the n/2 pulse length [8] are investigated in addition to the CW-NMR measurements in order to gain information about the sites with a nonzero electric field gradient, i.e., about the regions which deviate from cubic symmetry due to the proximity of defects or impurities.…”

Section: Introduction and Backgroundsmentioning

confidence: 99%

“…The present investigation concentrates on room-temperature 63Cu CW-NMR spectra, echoes in pulse NMR measurements [2][3][4][5][6]10] and the shortening of the n/2 pulse length [8]. Relaxation and Knight-shift-related properties are not the subject of this work.…”

Section: Introduction and Backgroundsmentioning

confidence: 99%

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Quadrupole effects in63Cu NMR spectroscopy of copper nanocrystals

et al. 2004

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Quadrupole effects in room-temperature continuous-wave (CW) 63Cu nuclear magnetic resonance (NMR) spectra, "n/2" pulse length shortening and amplitudes of two-pulse generated echoes were investigated on nanocrystalline copper powders produced by cryogenic melting and by ball milling techniques. Systematic measurements on the parent polycrystalline copper and on copper-based copper-palladium dilute alloys on the basis of the same experimental techniques were also made and the results were compared to that of the nanophase samples. Fractions of Cu nuclei contributing to the specific NMR responses and average field gradients coming from noncubie neighborhoods were estimated in all the investigated cases. The satellite and/or central component origins of NMR spectra of the samples are not a priori trivial even in the simplest case. Comparative analysis of CW and pulsed expe¡ allowed a surp¡ technological conclusion to be drawn by finding a smaller chemical impurity content inside the nanograins than the value characteristic of the entire sample. The measured deerease of the impurity eoncentration in the inner region of the copper nanopartieles is the consequenee of the applied technologies: eryogenic melting and ball milling. These preparation methods cause grain-boundary segregation and result in a cleaner inside of eopper nanoparticles.

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Section: Introduction and Backgroundsmentioning

confidence: 99%

Section: Introduction and Backgroundsmentioning

confidence: 99%

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Quadrupole effects in63Cu NMR spectroscopy of copper nanocrystals

et al. 2004

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“…Consequently, the rotational modulation of these interactions may be treated in a very uniform and general way using the irreducible spherical tensor operator formalism [19][20][21][22][23][24][25].…”

Section: 1mentioning

confidence: 99%

“…Steps 1 and 2 are concerned with the preparation of the Hamiltonian, which may vary from one spin system to another, and generally follow the irreducible spherical tensor formalism pioneered by Freed [19,20] and Sanctuary [21][22][23][24][25]. Steps 3 and 4 then detail the automated BRW theory processing steps.…”

Section: Symbolic Processing: Strategymentioning

confidence: 99%

Bloch-Redfield-Wangsness theory engine implementation using symbolic processing software

Kuprov

Wagner-Rundell

Hore

2007

Journal of Magnetic Resonance

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We describe a general method for the automated symbolic processing of Bloch-Redfield-Wangsness relaxation theory equations for liquid-phase spin dynamics in the algebraically challenging case of rotationally modulated interactions. The processing typically takes no more than a few seconds (on a contemporary single-processor workstation) and yields relaxation rate expressions that are completely general with respect to the spectral density functions, relative orientations, and magnitudes of the interaction tensors, with all cross-correlations accounted for. The algorithm easily deals with fully rhombic interaction tensors, and is able, with little if any modification, to treat a large variety of the relaxation mechanisms encountered in NMR, EPR, and spin dynamics in general.

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Radiofrequency Pulses: Response of Nuclear Spins

Bain

2011

Encyclopedia of Magnetic Resonance

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Multipole N.M.R.

Cited by 84 publications

References 24 publications

Quadrupole effects in63Cu NMR spectroscopy of copper nanocrystals

Quadrupole effects in63Cu NMR spectroscopy of copper nanocrystals

Bloch-Redfield-Wangsness theory engine implementation using symbolic processing software

Radiofrequency Pulses: Response of Nuclear Spins

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