NMR probe for dynamic-angle spinning

K. T. Mueller, G. C. Chingas, A. Pines

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We describe the design of a probe for dynamic-angle spinning (DAS) NMR experiments, comprised of a spinning cylindrical sample holder whose axis may be reoriented rapidly between discrete directions within the bore of a superconducting magnet. This allows the refocusing of nuclear spin magnetization that evolves under anisotropic interactions such as chemical shift anisotropy and quadrupolar coupling, providing high resolution NMR spectra for quadrupolar nuclei in solid materials. The probe includes an axial air delivery system to bearing and drive jets which support and spin a rotor containing the sample. Axis reorientation is accomplished with a pulley attached to the probehead and coupled to a stepping motor outside of the magnet. The choice of motor and gear ratio is based on an analysis of the moments of inertia of the motor and load, the desired angular resolution, and simplicity of design. Control of angular accuracy and precision are discussed, as well as the efficiency of radiofrequency irradiation and detection. High resolution DAS spectra of oxygen-17 and aluminum-27 nuclei in polycrystalline minerals illustrate the experimental capabilities.

Original languageEnglish (US)
Pages (from-to)1445-1452
Number of pages8
JournalReview of Scientific Instruments
Volume62
Issue number6
DOIs
StatePublished - Dec 1 1991

Fingerprint

metal spinning
Bearings (structural)
Nuclear magnetic resonance
Pulleys
nuclear magnetic resonance
Stepping motors
Superconducting magnets
probes
aluminum 27
Chemical shift
oxygen 17
pulleys
stepping motors
Magnets
Gears
jet propulsion
Magnetization
Anisotropy
nuclei
Minerals

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Mueller, K. T., Chingas, G. C., & Pines, A. (1991). NMR probe for dynamic-angle spinning. Review of Scientific Instruments, 62(6), 1445-1452. https://doi.org/10.1063/1.1142465
Mueller, K. T. ; Chingas, G. C. ; Pines, A. / NMR probe for dynamic-angle spinning. In: Review of Scientific Instruments. 1991 ; Vol. 62, No. 6. pp. 1445-1452.
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Mueller, KT, Chingas, GC & Pines, A 1991, 'NMR probe for dynamic-angle spinning', Review of Scientific Instruments, vol. 62, no. 6, pp. 1445-1452. https://doi.org/10.1063/1.1142465

NMR probe for dynamic-angle spinning. / Mueller, K. T.; Chingas, G. C.; Pines, A.

In: Review of Scientific Instruments, Vol. 62, No. 6, 01.12.1991, p. 1445-1452.

Research output: Contribution to journalArticle

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