Abstract

The room-temperature reflectance of evaporated amorphous selenium films was obtained between 4 and 14.4 eV. The reflectance spectrum was the same for fresh samples evaporated onto substrates held at 10°, 24°, and 60°C; however, aged selenium films had a 25% lower reflectance between 9 and 14 eV while between 4 and 5 eV the spectrum was the same as from a fresh film. Only the gross features of the spectrum of the amorphous films were similar to the monoclinic and trigonal crystalline forms, since almost all of the structure disappears in the amorphous spectrum when the long-range order of the crystal is lost. An analysis of the reflectance data using the Kramers–Kronig technique yielded the real (n) and imaginary (k) parts of the index of refraction, the real (1) and imaginary (2) parts of the dielectric constant, the absorption coefficient (α), and the energy-loss function (−Im−1).

© 1968 Optical Society of America

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