Abstract
We use the density functional perturbation theory to determine for the first time the pressure evolution of the Raman intensities for a mineral, the two high‐pressure structures of MgSiO3 perovskite and post‐perovskite. At high pressures, the Raman powder spectra reveals three main peaks for the perovskite structure and one main peak for the post‐perovskite structure. Due to the large differences in the spectra of the two phases Raman spectroscopy can be used as a good experimental indication of the phase transition.
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