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Tunneling of coupled methyl groups in lithium acetate: The isotope effect

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Zeitschrift für Physik B Condensed Matter

Abstract

We studied by high resolution inelastic neutron scattering the isotope effect of tunneling of coupled methyl groups in lithium acetate dihydrate (LIAC). Fully protonated, fully deuterated and mixed LIAC samples were investigated. The results are described by a simple model in which it is assumed that the single particle potential hindering rotation is strongly increased by deuteration, whereas the coupling potential is nearly unchanged. This allows to interpret the very strong isotope effect and also the spectra of the mixed compounds. The strong increase of the single particle potential by deuteration is tentatively explained by phonon mediated coupling.

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Authors and Affiliations

  1. Institut Laue-Langevin, Avenue des Martyrs-156X, F-38042, Grenoble Cedex, France

    A. Heidemann

  2. Physikalisch-Technische Bundesanstalt Braunschweig, Bundesallee 100, D-3300, Braunschweig, Federal Republic of Germany

    H. Friedrich & E. Günther

  3. Institut für Theoretische Physik I, Universität Erlangen-Nürnberg, Glückstrasse 6, D-8520, Erlangen, Federal Republic of Germany

    W. Häusler

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  1. A. Heidemann
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  2. H. Friedrich
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  3. E. Günther
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  4. W. Häusler
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Heidemann, A., Friedrich, H., Günther, E. et al. Tunneling of coupled methyl groups in lithium acetate: The isotope effect. Z. Physik B - Condensed Matter 76, 335–344 (1989). https://doi.org/10.1007/BF01321911

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  • DOI: https://doi.org/10.1007/BF01321911

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