Here, we report the energy positions of the conduction-band and valence-band edges of anatase titanium dioxide (TiO₂), strontium titanate (SrTiO₃), and barium titanate (BaTiO₃) by ionization potential measurements. From the photoelectron yield spectra, the ionization potentials of anatase TiO₂, SrTiO₃, and BaTiO₃ were estimated to be ca. 7.25, 6.90, 7.05 eV, respectively, which correspond to the top of the valence band of each titanium oxide. From these data and the band gaps, it was found that the bottoms of the conduction bands of SrTiO₃ and BaTiO₃ are positioned above that of anatase TiO₂ by 0.40 and 0.23 eV, respectively.

中文翻译：

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TiO ₂，SrTiO ₃和BaTiO ₃的导带和价带边缘的电离电势测量比较研究

在这里，我们通过电离电势测量报告了锐钛矿型二氧化钛（TiO ₂），钛酸锶（SrTiO ₃）和钛酸钡（BaTiO ₃）的导带和价带边缘的能量位置。根据光电子产率谱，估计锐钛矿型TiO ₂，SrTiO ₃和BaTiO ₃的电离电势为约。分别对应于每个二氧化钛的价带顶部的7.25、6.90、7.05 eV。根据这些数据和带隙，发现SrTiO ₃和BaTiO ₃的导带的底部位于锐钛矿型TiO ₂的导带的上方。 分别降低0.40和0.23 eV。