FTIR AND FT RAMAN-SPECTRA OF B6O

The IR active phonon spectrum of B6O is typical for the alpha-rhombohe dral boron structure group, The number of phonons corresponds exactly to that predicted by group theory. The phonon bands in the spectrum ar e weakly damped, indicating that the structure is largely undistorted, Contrary to the IR spectrum the FT Raman spectrum exhibits no narrow lines but considerably broadened bands, This leads to the conclusion t hat the strong optical excitation by the Nd:YAG laser with about 2W ir radiation power causes a considerable distortion of the structure by f luctuations in consequence of the interaction between optically excite d electrons and intraicosahedral phonons. (C) 1997 Academic Press.