Photoelectron spectroscopy of 9,10-dihaloanthracenes

摘要: Abstract The photoelectron spectra of anthracene and its 9,10-dichloro- dibromo-derivatives have been obtained. Analysis the is based mainly on shifts in molecular orbital ionization energies observed upon substitution. These are interpreted basis a perturbation model comprising short-range long-range inductive terms mesomeric term. electronic caused by halogen atom to depend largely unperturbed energy np electrons charge distribution orbitals. It has possible separate out Coulombic interactions which gap between hydrocarbon substituent Although observations not conclusive, owing fact that only two orbitals measurable shifts, results indicate α Cl ′, parameter, may well be negative, contrast previous work.