Hyper-Raman and Raman scattering in paratellurite TeO2 (pages 739–745)
Vincent Rodriguez, Michel Couzi, Frédéric Adamietz, Marc Dussauze, Guillaume Guery, Thierry Cardinal, Philippe Veber, Kathleen Richardson and Philippe Thomas
Version of Record online: 4 FEB 2013 | DOI: 10.1002/jrs.4251
We present for the first time a hyper-Raman scattering study of paratellurite. We have also revisited the Raman spectra of paratellurite. Anomalous polarization-selection-rules violations previously observed in Raman and due to optical activity are possible to avoid when light propagates at 45° of the Ox and Oy optical axes. From this single crystal study, all expected optical phonon modes frequencies and symmetries are given, except one E (LO) mode that could not be observed. We have evidenced a strong harmonic light scattering signal in the ZY′Y′ spectrum that we tentatively assigned to hyper-Raleigh optical activity that comes from a mixed dipolar electric–magnetic effect.