Hall Voltage Induced by Hydrogen Diffusion in Palladium

A Hall-type voltage induced by the fast diffusion of hydrogen in a metal (palladium) in a strong magnetic field has been detected. The sign and the magnitude of this voltage imply that hydrogen in palladium acts as a particle of charge $Z_{\mathrm{H}}=1\mathrm{}$. The presence of this effect is strong experimental evidence for the existence of the controversial direct-force term (i.e., the action of an electric field on the unscreened charge of an ion in a metal) in the theory of electromigration.