Recently we proposed a semiphenomenological theory for the calculation
of the optical properties of polyvalent metals. In this paper, we app
ly it to the heavy metal lead and show that, in contrast to the preced
ing paper, no fitting parameter is basically necessary. The general ag
reement between experimental results and theoretical curves if satisfa
ctory for all properties in both the solid and the liquid state. The o
ptical properties in the liquid state are more similar to those of the
solid state than to those of a free-electron system and therefore can
not be described by a simple Drude model.