Volume 48, Number 2, October II 1999
|Page(s)||187 - 193|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Excited-state vibrational tunnel splitting of hydrogen trapped by nitrogen in niobium
NIST Center for Neutron Research, National Institute of Standards and Technology Gaithersburg, MD 20899, USA
2 Institut für Festkörperforschung, Forschungszentrum Jülich GmbH D-52425 Jülich, Germany
3 Lehrstuhl für Kristallographie und Strukturphysik, Universität Erlangen-Nürnberg Bismarckstrasse 10, D-91054 Erlangen, Germany
Accepted: 30 August 1999
High-resolution inelastic-neutron-scattering spectra of hydrogen trapped by interstitial nitrogen impurities in have been measured to study the vibrational lineshape of the broad feature previously observed for . The spectrum measured at exhibits clear evidence of a doublet that disappears at higher temperatures. We interpret this result as the first spectroscopic observation of excited-state tunnel splitting of light-atom (H) vibrations in a solid-state double-well potential. We also show that both the observed excited-state splitting of and the previously measured ground-state splitting are well represented by a hardened-harmonic-well potential.
PACS: 66.35.+a – Quantum tunneling of defects / 34.20.Cf – Interatomic potentials and forces / 61.12.Ex – Neutron scattering techniques (including small-angle scattering)
© EDP Sciences, 1999
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