The optical absorption in flash‐evaporated 2O3 thin films is studied in the photon energy range 0.6 to 6.2 eV. Tetragonal Bi2O3 is found to be an indirect gap insulator with an energy gap of ≈ 2.6 eV at room temperature. At 5.6 eV a peak in the extinction is evidenced. In the transparent region of the layers the variations in transmission are mainly due to interference phenomena. Optical constants and thickness are determined from the fringe pattern of the transmission spectrum.

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