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Influence of argon flow on the optical properties of titanium oxide films, which were fabricated on well-polished K9 glass substrate through r.f. magnetron sputtering, has been investigated. X-ray diffraction (XRD) was employed to analyse the microstructure. Surface morphology was observed by atomic force microscopy (AFM). Transmittance of the films was measured within the visible range by UV-3600 spectrometer. The optical constants, such as thickness, refractive index and extinction coefficient, were measured using an ellipsometer. The experimental results and the effects of argon flow on optical constants of the TiO2films have been discussed and analysed.