Accession Number : ADA183681

Title :   Fast-Atom Bombardment of Molten Boron Trioxide,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Doyle,Robert J , Jr

PDF Url : ADA183681

Report Date : Jul 1987

Pagination or Media Count : 5

Abstract : 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 -B=O 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.

Descriptors :   *BORON OXIDES, BORON, IONS, CONSISTENCY, GEOMETRY, SURFACE PROPERTIES, HIGH VISCOSITY, LOW PRESSURE, VAPOR PRESSURE, HIGH TEMPERATURE, RANGE(EXTREMES), TEMPERATURE, MOLECULAR WEIGHT, OBSERVATION, CHAINS, MELTS, OXIDES, ATOMS, OXYGEN

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE