| Summary: | The way ab initio simulation provides the vibrational properties of crystalline compounds is described. The transverse optical (TO) and longitudinal optical (LO) branches of the infrared (IR) spectrum, the TO-LO splitting, the IR intensities, the vibrational contribution to the dielectric tensor, the Born effective charges, and the reflectance spectrum of large unit cell compounds such as forsterite (Mg2SiO4, 28 atoms/cell, olivine family) and grossular (Ca3Al2Si3O12, 80 atoms/cell, garnet family), are presented and discussed. Tools for the interpretation of the atomic motion for each normal mode are illustrated with examples.
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