Effusion-mass spectrometric study of the thermodynamic properties of BO? and BO ? 2

Abstract

Thermodynamic properties were obtained for negative ions of the lower boron oxides by means of the Knudsen cell-mass spectrometer method over the temperature range 1623-2100 K. Second and third law studies were conducted involving negative ions with neutral atoms and molecules for the reactions BO(g)+Cl^–(g)= BO^–(g)+ Cl(g), BO₂(g)+ Cl^–(g)= BO^– ₂(g)+Cl(g). The heats of formation ΔH_f298 for the negative ions BO^– and BO^– ₂ were obtained from the reaction thermodynamics as –71.9±2.0 and –159.3±2.0 kcal/mol, respectively. The electron affinities were E.A.(BO)= 71.9±2.0 kcal/mol and E.A.(BO₂)= 82.3±3.0 kcal/mol.