CALCULATED OPTICAL-PROPERTIES OF HEAVY-ME TALS .1. RELATIVISTIC FORMALISM AND CUBIC 5D METALS

The formalism for calculation of the optical properties of solids with in the random phase approximation and the relalivistic linear muffin-t in-orbital method is presented. The method is applied to the cubic 5d metals Ta, W, Ir, Pt, and Au using the local density approximation. Th e band structures, the lj projected densities of states, the complex d ielectric functions. the optical conductivities, and the electron ener gy-loss spectra are evaluated in the energy range from 0 to 30 eV. Goo d agreement with the experimental data is found.