SURFACE DIPOLE-MOMENTS FROM LEED INVESTIGATIONS

Alkali adsorbates on transition metals have traditionally given Poor R factors for LEED theory/ experiment comparison. In this paper we post ulate that at least part of the remaining discrepancy is due to the no n-spherical potential caused by a dipole moment on the alkali atom. In clusion of a dipole in the fitting procedure gives a reasonable magnit ude for the dipole, and a location not far from the centre of the alka li. The R factor shows a substantial improvement.