Reflectivities of Evaporated Metal Films in the Near and Far Ultraviolet

Abstract

The reflectivities of evaporated metal films from the visible to 450A have been determined for the following metals: Aluminum, antimony, beryllium, bismuth, cadmium, chromium, copper, gold, iron, lead, magnesium, manganese, molybdenum, nickel, palladium, platinum, silver, tellurium, titanium, zinc and zirconium. Photographic methods were used. From the visible to 2400A, a quartz mercury arc with calibrated wire screens and a quartz prism spectrograph were employed. From 2400A to 450A it was necessary to use a vacuum spectrograph with grating, a discharge tube, and oiled photographic film. The accuracy of the work in the near ultraviolet is of the order of three percent and in the far ultraviolet not better than five percent. Curves of reflectivity against wave-length for these metals are included.