DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
Fast-Atom Bombardment of Molten Boron Trioxide,
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
Fast-atom bombardment mass spectra of vitreous boron trioxide B2O3 has been obtained at sample temperatures below and above the melting point of B2O3 450 C. The experiments utilized a new high-temperature sample holder that has been described in detail elsewhere 1. Spectra were obtained over a sample temperature range of 150-700 C. Boron trioxide is thermally stable over this temperature range and its low vapor pressure and high viscosity assure a long lived sample and a consistent surface geometry. The technique enabled the first observation of high-molecular-weight, gas-phase boron oxides see figure. Collision-induced dissociation of the boron oxide ions revealed structures composed of branched chains of alternating boron and oxygen atoms terminated by -BO bonds. This observation is consistent with the structure of condensed-phase B2O3, which is composed of infinite chains of BO3 units linked by -B-O-B- bonds.
APPROVED FOR PUBLIC RELEASE