Fifth European Conference on Internal Friction and Ultrasonic Attenuation in Solids

J. Phys. Colloques 48 (1987) C8-281-C2-286
DOI: 10.1051/jphyscol:1987840

TUNNELLING MOTION AND INTERNAL FRICTION OF HYDROGEN IN METALS

I. SVARE

Physics Department, University of Trondheim, N.T.H., N-7034 Trondheim, Norway

Abstract
Tunnelling motion of hydrogen in metals is possible in excited states and through two-phonon transitions. Asymmetry between the H sites blocks the tunnelling and permits only slow classical hopping. We discuss in a simple model the various tunnelling rates, and we get quantitative agreement between many types of experimental data for H, D and T in Pd, V, Nb and Ta. PACS no. 6240, 6320 M, 6630 J.

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