Abstract

The reflectance and optical constants of evaporated iridium films were measured in the wavelength region from 500 to 2000 Å. The films were evaporated by electron bombardment and deposited at various rates onto glass substrates of various temperatures. Their optical constants were determined from reflectance measurements made at different angles of incidence. In contrast to aluminum and other oxide-film-forming metals, iridium showed very little change in reflectance during exposure to air. Films with highest normal incidence reflectance were obtained by evaporation onto substrates heated to 300°C and more. Owing to interference, semitransparent films of 100 to 200 Å on glass showed higher reflectance than opaque films at most wavelengths in the vacuum ultraviolet. Iridium films produced under optimum conditions had a reflectance of about 27% at 550 Å.

© 1967 Optical Society of America

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