High-Temperature Photoelectron Spectroscopy: A Study of the Alkaline Earth Oxides SrO and BaO

摘要

Vacuum ultraviolet photoelectron spectra of vapor-phase Strontium Oxide and Barium Oxide have been recorded and the spectra interpreted by ab initio molecular orbital calculations and Hartee-Fock-Slater calculations. The first band onsets of BaO and SrO have been measured as 6.46 + or - 0.07 and 6.60 + or - 0.05 eV, respectively, and these lead to upper limits of the dissociation energies, Doo in BaO +(X2 signat +) and SrO+(X2 signat +) of 4.37 + or - 0.08 and 3.36 + or - 0.14 eV. Chemielectron spectra are presented for the BaO + H2O and SrO + H2O reactions.