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Polarization-dependent far-infrared reflectivity measurements were carried out on single crystals of anatase TiO 2. The results were analyzed to yield the dielectric dispersion properties of anatase in the lattice fundamentals regime. The frequencies ͑in cm Ϫ1 ͒ of the transverse optical ͑TO͒ and longitudinal optical ͑LO͒ zone-center phonons were determined to be 367͑755͒ for the TO ͑LO͒ of the A 2u mode, 262͑366͒ and 435͑876͒ for the E u modes. The large TO-LO splittings were used to estimate effective charges. ͓S0163-1829͑97͒02009-2͔

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