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1 UR GEOTROPE, Institut de Recherche pour le Développement (IRD), 213 rue La Fayette, 75480, Paris cedex 10, France
2 Institut de Minéralogie et Physique des Milieux Condensés (IMPMC), UMR CNRS 7590, Universités Paris VI et VII, IPGP, 4 Place Jussieu, 75252 Paris Cedex 05, France
Correspondence: * E-mail: balan{at}lmcp.jussieu.fr
The theoretical infrared (IR) and Raman spectra of gibbsite [
-Al(OH)3] were computed using ab initio quantum mechanical calculations. The low-frequency dielectric tensor and the Raman tensors of gibbsite were determined using linear response theory. The transmission powder IR spectrum was found to strongly depend on the shape of the gibbsite particles. In the region of the OH-stretching bands, an excellent agreement between theory and experiment was obtained, providing an unambiguous interpretation of the OH bands in terms of vibrational modes. In contrast, the assignment of the bands observed at lower frequency is complicated by the significant overlap between neighboring bands together with their sensitivity to particle shape.
Key Words: IR spectroscopy Raman spectroscopy quantum mechanical calculation gibbsite
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