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- W2011393752 abstract "Abstract A multisite exchange treatment is developed to simulate NMR powder lineshapes in cases where motional processes of more than one type occur simultaneously. An example is presented where one type involves rotational diffusion, libration, or oscillation over a limited range whereas the other includes jumps of larger amplitudes between potential minima, the axis of motion being the same for both types. Restricted rotation of lower angular amplitude is conceived in terms of jumps between sites within one well with the amplitude of this restricted rotation being the key parameter which can be the same or different for each potential minimum. The second motional process of larger amplitude involves a series of jumps between sites in one well to sites in the other well. In the cases treated, the first process is always considered too fast to exhibit rate-dependent effects. One rate parameter is used for all jumps. This rate is always kept sufficiently large to keep the first process in the rapid exchange limit. At very large rates, both motions exhibit rate-independent effects. At slower rates, the rate dependence of the second process leads to conspicuous changes in the lineshape. The model sets an equal probability for all jumps and represents an alternative to the conventional treatment where one deals with the processes sequentially. The method is illustrated for the case of bisphenol-A polycarbonate (BPAPC), where results show an improvement over the previously published treatment based on a sequential approach." @default.
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- W2011393752 date "1985-10-01" @default.
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- W2011393752 title "The application of a simultaneous model for multisite exchange to solid-state NMR lineshapes" @default.
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- W2011393752 doi "https://doi.org/10.1016/0022-2364(85)90107-6" @default.
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