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• W2054161097 abstract "A new method is introduced for analyzing deuteron spin–lattice relaxation in molecular systems with a broad distribution of activation energies and correlation times. In such samples the magnetization recovery is strongly non-exponential but can be fitted quite accurately by three exponentials. The considered system may consist of molecular groups with different mobility. For each group a Gaussian distribution of the activation energy is introduced. By assuming for every subsystem three parameters: the mean activation energy E0, the distribution width σ and the pre-exponential factor τ0 for the Arrhenius equation defining the correlation time, the relaxation rate is calculated for every part of the distribution. Experiment-based limiting values allow the grouping of the rates into three classes. For each class the relaxation rate and weight is calculated and compared with experiment. The parameters E0, σ and τ0 are determined iteratively by repeating the whole cycle many times. The temperature dependence of the deuteron relaxation was observed in three samples containing CD3OH (200% and 100% loading) and CD3OD (200%) in NaX zeolite and analyzed by the described method between 20 K and 170 K. The obtained parameters, equal for all the three samples, characterize the methyl and hydroxyl mobilities of the methanol molecules at two different locations." @default.
• W2054161097 created "2016-06-24" @default.
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• W2054161097 date "2013-02-01" @default.
• W2054161097 modified "2023-09-24" @default.
• W2054161097 title "Deuteron spin–lattice relaxation in the presence of an activation energy distribution: Application to methanols in zeolite NaX" @default.
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• W2054161097 doi "https://doi.org/10.1016/j.ssnmr.2012.11.004" @default.
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