Evidence that the structures of many borate glasses are dominated by superstructural units can be obtained from spectroscopic data which is thus useful for testing models of glass structure. The inelastic neutron scattering technique is now able to supplement information gained from optical measurements and offers unique information due to the lack of selection rules and matrix element effects. The use of this technique to investigate the role of superstructural units in borate glass structures is reviewed in the light of the controversy concerning the structure of vitreous B203 discussed in detail at the previous Borate Conference. In this paper, new data are presented for the neutron weighted density of vibrational states for samples of vitreous B203.
