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Pulsed NMR studies of water under extreme conditions [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1978.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 175 : digital, PDF file
Additional Creators
University of Illinois at Urbana-Champaign, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The dynamic structure of water and heavy water was studied using NMR spin-lattice relaxation and self-diffusion techniques. For both compounds, the relaxation rate is proportional to the ratio of viscosity to absolute temperature at constant density. The coupling between rotational and translational motions decreases with increasing temperature and increasing density. The temperature and density dependence of the deuteron quadrupole coupling constant in D/sub 2/O was determined. The proton spin-lattice relaxation times of supercritical H/sub 2/O were measured from 400 to 700/sup 0/C and to 1 kbar. The times were found to be roughly proportional to density and were found to decrease with temperature. The angular momentum correlation times tau/sub J/ were calculated and compared with the times between collisions for a hard sphere fluid, the Enskog times, tau/sub E/. The values of tau/sub E//tau/sub J/ were roughly 6 at 400/sup 0/C and low densities. The values decreased at higher densities and higher temperatures. The proton spin-lattice relaxation times of H/sub 2/O were also measured from 90 to 350/sup 0/C up to 2 to 5 kbar. The data clearly show the change from dipolar to spin-rotation relaxation as a function of temperature and density. Both the low and the high temperature results agree with the idea that it is the strong and anisotropic intermolecular potential which causes the dynamic behavior of water to be so different from that of normal liquids.
Report Numbers
E 1.99:coo--1198-1222
coo--1198-1222
Subject(s)
Other Subject(s)
Dissertation Note
T
Note
Published through SciTech Connect.
01/01/1978.
"coo--1198-1222"
DeFries, Timothy Hatmaker.
Funding Information
EY-76-C-02-1198
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