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- W2010488755 abstract "Pulsed NMR experiments have been performed under pressure (P<4.1 kbar) on phases I and II of solid ${mathrm{NH}}_{3}$ and ${mathrm{ND}}_{3}$. Line narrowing in ${mathrm{NH}}_{3}$-II demonstrates that rapid rotations and diffusion occur. The proton ${T}_{1}$ reflects an activation energy of diffusion of 4400 K (ifmmodepmelsetextpmfi{}20%). The jump time close to the melting point in ${mathrm{NH}}_{3}$-II is 6ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}8}$ s. The hexagonal structure of ${mathrm{ND}}_{3}$-II is confirmed by the observation of a small quadrupole splitting of the deuteron spectrum. The orientation correlation time, as determined from the deuteron ${T}_{1}$, is 1.0ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}12}$ s. Thus, ammonia-II is a typical rotor-phase solid. In ${mathrm{NH}}_{3}$-I, the pressure dependences of the proton ${T}_{1}$ and ${T}_{1D}$ are used to determine the activation volumes of threefold rotations and diffusion, respectively. By comparing with stimulated-echo experiments in ${mathrm{ND}}_{3}$-I, we find a small isotope effect upon the diffusion rate. No proton or deuteron NMR evidence was found corresponding to the previously reported premelting transition indicated by the anomalous attenuation of ultrasound in phase I." @default.
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- W2010488755 date "1986-01-01" @default.
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- W2010488755 title "NMR in high-pressure phases of solid<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>NH</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>ND</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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- W2010488755 doi "https://doi.org/10.1103/physrevb.33.14" @default.
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