Reflectance spectroscopy of oxide films. II. Oxide layers on chromium metal

Infrared reflectance spectra of oxidized chromium are presented as the first of a series of investigations of the reflectance spectra of oxidized materials. The spectra agree well with the behavior predicted in an earlier note, and confirm that simultaneous identification and thickness measurements of corrosion films are possible using this technique. The most prominent features for identification purposes are absorption bands at 610, 540, and 440 cm^–1 for films 1.5- thick, and at 610 and 300 cm^–1 for thicker films. These bands are discernable despite the complicated effects introduced by interference fringes in the low-energy spectral region.