Abstract

The optical properties of evaporated rhodium films were investigated in the wavelength region from 150 to 2000 Å. The films were evaporated by electron bombardment and deposited at various rates onto glass substrates of different temperatures. Their optical constants were determined from reflectance measurements made at different angles of incidence. Films with highest normal-incidence reflectance were obtained by evaporation onto substrates heated to 300°C and higher. Because of interference effects, semitransparent films of 100–200-Å thickness on glass showed higher reflectance than opaque films, at most wavelengths in the vacuum ultraviolet. For wavelengths longer than 1600 Å, the reflectance of rhodium is higher than that of platinum and iridium; however, in the shorter-wavelength range its reflectance is slightly lower. Unlike platinum and iridium, rhodium has a minimum of reflectance approximately at 1216 Å, the Lyman-α line of hydrogen. Thus it should prove useful as a coarse rejection filter for 1216 Å.

© 1971 Optical Society of America

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