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Intermolecular Dipole–Dipole Relaxation of 129Xe Dissolved in Water

✍ Scribed by Ivan E Dimitrov; Ravinder Reddy; John S Leigh

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
75 KB
Volume
145
Category
Article
ISSN
1090-7807

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✦ Synopsis

Intermolecular (129)Xe-(1)H nuclear Overhauser effects and (129)Xe longitudinal relaxation time measurements were used to demonstrate that the dipole-dipole coupling is the dominant relaxation mechanism for (129)Xe in water, at room temperature. (129)Xe-(1)H cross-relaxation rates were derived to be sigma(XeH) approximately 3.2 +/- 0.3 x 10(-3) s(-1), independent of xenon pressure (in the range of 1-10 bar) and of the presence of oxygen. Corresponding xenon-proton internuclear distances were calculated to be 2.69 +/- 0.12 A. Using the magnitude of the dipole-dipole coupling and the spin density ratio between dissolved xenon and bulk water, it is estimated that (129)Xe-(1)H spin polarization-induced nuclear Overhauser effects would yield little net proton signal enhancement in water.

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