Dispersion relations for noble metals in the resonant model potential

Abstract

The resonant model potential is of the form v_o(E)=w_o(E)+v_res(E), where w_o(E) is the standard Heine-Abarenkov type model potential and v_res(E) the resonant non-local potential acting on d states. Two sets of w_o(E) are used: the first one is local whereas the second set corresponds to a more accurate non-local form. When these two sets of parameters are applied in the calculation of phonon frequencies in noble metals, a good agreement is found between the experimental and computed results for all the noble metals on the use of the first set of parameters. The application of the second set of parameters gives a little improved dispersion results for Cu and Ag, but the dispersion curves for Au are deteriorated. Possible region of this deterioration has been discussed.