Study Of The Ionization Process Bf+(X2-Sigma+) [-Bf(X1-Sigma+) By High-Temperature Photoelectron-Spectroscopy

The He I photoelectron spectrum of the BF molecule, produced by passing BF3 over heated boron, has been recorded. Only one band was observed and it was assigned to the ionization BF+(X2∑+)â†� BF(X1∑+). For this band the adiabatic and vertical ionization potentials were coincident at 11.12 ± 0.01 eV and analysis of the observed vibrational structure gave text-decoration:overlinewe= 1765 ± 20 cm–1 and re= 1.208 ± 0.005 A for the BF+(X2∑+) state. Estimates of the first and higher vertical ionization potentials of BF are made by ab initioΔSCF and Hartree–Fock–Slater calculations.