Authors: H. Nägerl 1 and F. Freund
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  • 1 IV. Physikalisches Institut der Universität Göttingen B R.D.
  • | 2 Mineralogisch-Petrographisches Institut der Universität Köln B.R.D.
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The conditions have been studied under which the proton of an ionic OH group can leave the electron cloud of the O2− ion to form a H2O molecule with a neighbouring OH group. The condition of tunnelling is the presence of a free acceptor level of similar height in the neighbouring OH group. If the two OH groups are equivalent crystallographically, this condition is not fulfilled since the acceptor level lies higher than the donor level. Coupling with the opposite-phase OH bending vibrations leads to a broadening of the levels and finally to an overlap, which renders the tunnelling possible. The proton transfer starts at the surface as at any given temperature the amplitude of the effective OH bending vibrations is larger at the surface than inside the crystal.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
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Founder Akadémiai Kiadó
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Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
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ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)