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Selective Spin Excitation and Relaxation in Nuclear Quadrupole Resonance

Selective Spin Excitation and Relaxation in Nuclear Quadrupole Resonance Nuclear relaxation in a quadrupolar spin system has been investigated by selectively exciting nuclei into particular magnetic levels and observing the transient recovery of the spin system toward an equilibrium population distribution. Selective excitation is achieved by correlating the frequency and precessional behavior of nuclei in certain states with applied elliptically and linearly polarized, pulsed radio-frequency fields. A quantum-mechanical analysis is presented to describe the excitation of a quadrupolar spin system produced by a pulsed, elliptically polarized rf field. Using selective excitation techniques, several new modes of longitudinal relaxation are observed. Experiments using the chlorine quadrupole resonance in a single crystal of KCl O 3 demonstrate how these new relaxation modes are used (1) to study dynamic spin-spin interactions and cross relaxation between overlapping resonance lines, and (2) to determine the individual Δ m = ± 1 and ± 2 quadrupolar spin-lattice relaxation transition probabilities. A method is introduced by which the magnetic dipole-dipole contribution to the resonance linewidth can be determined independently of static quadrupole broadening, by observing the decay of the beat modulation of certain free-induction signals caused by precession in a small magnetic field. The measured magnetic linewidth of Cl 35 in KCl O 3 is in good agreement with the value obtained from a second-moment calculation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Selective Spin Excitation and Relaxation in Nuclear Quadrupole Resonance

Physical Review , Volume 120 (2) – Oct 15, 1960
13 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1960 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.120.365
Publisher site
See Article on Publisher Site

Abstract

Nuclear relaxation in a quadrupolar spin system has been investigated by selectively exciting nuclei into particular magnetic levels and observing the transient recovery of the spin system toward an equilibrium population distribution. Selective excitation is achieved by correlating the frequency and precessional behavior of nuclei in certain states with applied elliptically and linearly polarized, pulsed radio-frequency fields. A quantum-mechanical analysis is presented to describe the excitation of a quadrupolar spin system produced by a pulsed, elliptically polarized rf field. Using selective excitation techniques, several new modes of longitudinal relaxation are observed. Experiments using the chlorine quadrupole resonance in a single crystal of KCl O 3 demonstrate how these new relaxation modes are used (1) to study dynamic spin-spin interactions and cross relaxation between overlapping resonance lines, and (2) to determine the individual Δ m = ± 1 and ± 2 quadrupolar spin-lattice relaxation transition probabilities. A method is introduced by which the magnetic dipole-dipole contribution to the resonance linewidth can be determined independently of static quadrupole broadening, by observing the decay of the beat modulation of certain free-induction signals caused by precession in a small magnetic field. The measured magnetic linewidth of Cl 35 in KCl O 3 is in good agreement with the value obtained from a second-moment calculation.

Journal

Physical ReviewAmerican Physical Society (APS)

Published: Oct 15, 1960

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