BORON-OXIDE OLIGOMER COLLISION-INDUCED DISSOCIATION - THERMOCHEMISTRY, STRUCTURE, AND IMPLICATIONS FOR BORON COMBUSTION

This paper presents a comprehensive collision-induced dissociation and ab initio study of small boron oxide cations, BnOm+, motivated by a n eed for more accurate and reliable structural and thermodynamic inform ation on both neutral and ionic boron oxides. Absolute fragmentation c ross sections were measured for all observable BnOm+ (n < 4, m < 5) pa rent ions at center-of-mass collision energies ranging from 0.08 to 10 eV. Quantitative dissociation thresholds, generated from the experime ntal data by correcting for the collision energy spread resulting from the beam energy distribution and the thermal motion of the target gas , are compared to ab initio dissociation energies determined from Gaus sian-2 calculations.