2006 Volume 35 Issue 8 Pages 884-885
Unpolarized infrared spectroscopic study was carried out on thin nanocrystalline anatase TiO2 films with grain size of ≈20 nm. The transverse optical lattice vibration frequencies are the same as that of single-crystal anatase. The longitudinal optical modes can be detected with an oblique unpolariation at incident angles ≥50°. The broad LO absorption peak is a combination of the A2u LO and the Eu LO modes’ resonant response to the infrared radiation.
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