Nuclear spin resonance of (129)Xe doped with O(2).

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Nuclear spin resonance of (129)Xe doped with O(2). Abstract Text:

J W McNabb,D N Balakishiyeva,A Honig,J W McNabb,D N Balakishiyeva,A Honig,

Spin-lattice relaxation of (129)Xe nuclei in solid natural xenon has been investigated in detail over a large range of paramagnetic O(2) impurity concentrations. Direct measurements of the ground state magnetic properties of the O(2) are difficult because the ESR (electron spin resonance) lines of O(2) are rather unstructured, but NMR measurements in the liquid helium temperature region (1.4-4 K) are very sensitive to the effective magnetic moments associated with the spin 1 Zeeman levels of the O(2) molecules and to the O(2) magnetic relaxation. From these measurements, the value of the D[Sz(2)-(1/3)S(2)] spin-Hamiltonian term of the triplet spin ground state of O(2) can be determined. The temperature and magnetic field dependence of the measured paramagnetic O(2)-induced excess line width of the (129)Xe NMR signal agree well with the theoretical model with the spin-Hamiltonian D=0.19 meV (2.3 K), and with the reasonable assumption that the E[S(x)(2)-S(y)(2)] spin-Hamiltonian term is close to 0 meV. An anomalous temperature dependence between 1.4 K and 4.2K of the (129)Xe spin-lattice relaxation rate, T(1n)(-1)(T), is also accounted for by our model. Using an independent determination of the true O(2) concentration in the Xe-O(2) solid, the effective spin lattice relaxation time (which will be seen to be transition dependent) of the O(2) at 2.3 K and 0.96 T is determined to be approximately 1.4 x 10(-8)s. The experimental results, taken together with the relaxation model, suggest routes for bringing highly spin-polarized (129)Xe from the low temperature condensed phase to higher temperatures without excessive depolarization.

Nuclear spin resonance of (129)Xe doped with O(2). Publishing Authors By Initials

JW McNabb,DN Balakishiyeva,A Honig,JW McNabb,DN Balakishiyeva,A Honig,

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Nuclear spin resonance of (129)Xe doped with O(2). Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of magnetic resonance (San Diego, Calif. :

VOLUME: 188

Page Numbers: 206-15

Journal Abbreviation: J. Magn. Reson.

ISSN: 1090-7807

DAY: 17

MONTH: 07

YEAR: 2007

Nuclear spin resonance of (129)Xe doped with O(2). Information

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LANGUAGE: eng

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Grant and Affiliation Information for Nuclear spin resonance of (129)Xe doped with O(2).

AFFILIATION: Physics Department, Syracuse University, Syracuse, NY 13244, USA.

Country: United States

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MEDLINETA: J Magn Reson

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