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- W2090923610 abstract "The proton magnetic resonance lineshapes of NH4ClO4 and NH4PF6 at liquid helium temperature are narrower than those usually expected for rapidly tunnelling ammonium ions. The narrowing is temperature-dependent, suggesting a kinetic process that involves a modulation of the tunnelling states. A possible “exchange-narrowing” mechanism involving fluctuating molecular torsional states brought about by external lattice perturbations is considered, and is seen to lead to a satisfactory simulation of the observed low-temperature lineshapes. Activation energies of 0.9 ± 0.1 K and 1.7 ± 0.5 K governing the exchange process are derived for the cases of NH4ClO4 and NH4PF6, respectively." @default.
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- W2090923610 date "1975-09-01" @default.
- W2090923610 modified "2023-10-17" @default.
- W2090923610 title "On the temperature dependence of proton magnetic resonance lineshapes of tunnelling ammonium in NH4ClO4 and NH4PF6" @default.
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- W2090923610 doi "https://doi.org/10.1016/0009-2614(75)85608-9" @default.
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