Study of a structure of boron–oxygen complexes in the molten and vapor states by Raman and luminescence spectroscopies

High temperature Raman and luminescence spectroscopies were used for studying the reconstruction processes in overheated melts and vapors of alkali and alkali-earth borates and boric oxide up to 1800 K. New boron–oxygen fragments in form of the monomeric [BO2]1−-anions were determined to be present in the overheated metaborates melts. Luminescence spectra of the BO2-radicals were measured in vapors over overheated borate melts at the selective laser excitation. These spectra were shown to differ from those of the BO2-radicals produced by the flash photolysis. An effect temperature and atmosphere sort on the BO2-radicals formation in the vapor state were studied.