Polarization-resolved Raman spectra of α -PtO₂

Using density functional theory, we investigate the vibrational properties and polarization-resolved Raman spectra of α -PtO₂ and obtain the Raman tensor and angle-dependent Raman intensity of α -PtO₂. It is found that the polar plot of A _1g mode in parallel polarization configuration is useful in identifying the orientation of the crystal. The Raman intensity of the E_g mode is about five times stronger than that of the A_1g mode. The Raman intensity is about three times stronger when the wave vector of the incident light is in x or y direction than in z direction. Our work will help the material scientists to characterize the α -PtO₂ and to identify its orientation by comparing the experimental spectra with our result.