Photoelectron spectroscopy of high-temperature vapors. III. Monomer and dimer spectra of thallous fluoride

Abstract
The 584 Å photoelectron spectra of the monomer and dimer of thallous fluoride are presented. The observed dimer peaks are compared with semiempirical calculations based on both a planar rhombic and a symmetric linear geometry. The present experiment indicates that the thallous fluoride dimer has a linear F–Tl–Tl–F structure. The chemical bonding in the dimer is discussed. The dimer exhibits covalent bonding characteristics, whereas the monomer exhibits the ionic bonding characteristics typical of all the Group III monohalides.