Comment on "Observation of an index-of-refraction-induced change in the Drude parameters of Ag films"

Abstract

It is shown that the recently observed differences in the optical constants of Ag films measured at the metal-air and metal-liquid interfaces by Gugger et al. [Phys. Rev. B 30, 4189 (1984)] can be attributed to the presence of the thin contamination layer that forms on a clean Ag film exposed to room air.