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- W2092604098 abstract "The orientationally ordered crystalline and glassy plastically crystalline phase of cyanoadamantane were investigated using H2 NMR. Solid-echo line shape, two-dimensional spectrum, and spin-lattice relaxation were analyzed. In both phases, the molecules display solely a rotation around the molecular C3 symmetry axis. For the orientationally ordered phase, a single correlation time characterizes the motion, and the time constant shows an Arrhenius temperature dependence. In contrast, a broad distribution G[ln(τ)] of correlation times is observed for the glassy plastically crystalline phase that leads to characteristically different NMR features such as “two-phase” spectra and pronounced nonexponential relaxation. The distribution G[ln(τ)] can be derived from a temperature independent distribution of activation energies g(Ea), with its mean value lying significantly below the activation energy corresponding to the ordered phase. Thus, the molecular uniaxial rotation proves to be a sensitive probe for the energy landscape of the orientationally disordered glassy crystalline phase of cyanoadamantane." @default.
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- W2092604098 date "2007-01-02" @default.
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- W2092604098 title "H 2 nuclear magnetic resonance study on the molecular motion in cyanoadamantane. II. Orientationally ordered and glassy crystalline phase" @default.
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- W2092604098 doi "https://doi.org/10.1063/1.2409695" @default.
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