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- W1652806434 abstract "The properties of cross relaxation between dipolar and rotating-frame Zeeman nuclear-spin subsystems in the metal hydride ${mathrm{YH}}_{2}$ and deuteride ${mathrm{YD}}_{2}$ are examined using pulsed NMR spin-locking measurements in single resonance experiments on the $^{89}mathrm{Y}$ spin system. A thermodynamic model is presented to describe the spin dynamics. Observed equilibrium values of the $^{89}mathrm{Y}$ magnetization are described in terms of the magnetic heat capacities of the subsystems and provide a measure of the second moment of the nonresonant spins. Measured cross-relaxation spectra are described in terms of proton dipolar fluctuations; a comparison with numerically calculated spectra is presented. Additional insight into the strength and spectral width of the cross relaxation is provided by comparing the isotopes ${mathrm{YH}}_{2}$ and ${mathrm{YD}}_{2}$. The calculated spectra decay exponentially with the $^{89}mathrm{Y}$ rotating-frame angular frequency, with characteristic widths of 38.6 ensuremath{mu}s for ${mathrm{YH}}_{2}$ and 1.003 ms for ${mathrm{YD}}_{2}$. In addition to the quasiequilibrium cross-relaxation processes, large transient oscillations in Zeeman-dipolar order are observed and discussed. Finally, results from spin-echo measurements indicate that transverse decay processes are describable by the same fluctuation spectrum used in the description of cross relaxation." @default.
- W1652806434 created "2016-06-24" @default.
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- W1652806434 date "1987-11-01" @default.
- W1652806434 modified "2023-09-25" @default.
- W1652806434 title "Spin dynamics ofYH2andYD2" @default.
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- W1652806434 doi "https://doi.org/10.1103/physrevb.36.6993" @default.
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