J. Phys. Colloques
Volume 48, Numéro C8, Décembre 1987Fifth European Conference on Internal Friction and Ultrasonic Attenuation in Solids
|Page(s)||C8-281 - C2-286|
J. Phys. Colloques 48 (1987) C8-281-C2-286
TUNNELLING MOTION AND INTERNAL FRICTION OF HYDROGEN IN METALSI. SVARE
Physics Department, University of Trondheim, N.T.H., N-7034 Trondheim, Norway
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.