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The optical band gap and optical constants of as deposited and annealed thin films with thickness 3000Å prepared by thermal evaporation technique of Se 75 S 25−x Cd x (where x=0, 2, and 4) chalcogenide glasses have been investigated as a function of photon energy in the wavelength region 400–1000nm. Thin films were thermally annealed for one hour at three different temperatures...
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