RAMAN SCATTERING AND INFRARED REFLECTION STUDY ON LATTICE VIBRATION OF THE β -BaB2O4 CRYSTAL
The lattice vibration of the β -BaB2O4 crystal have been analyzed with the aid of group theory. The Raman and infrared reflection spectra of this crystal have been investigated. Using a model of quasi-Layer molecular structure, the experimental results can be explained satisfactorily with an assignment of all internal and external vibrational modes.