Methyl- and Dimethylketene: He I Photoelectron Spectra and Vertical Ionization Potentials Calculated by Using Perturbation Corrections to Koopmans' Theorem

Article abstract of DOI:10.1021/j150652a007

He I photoelectron spectra are reported for the monomethyl and dimethyl derivatives of ketene, H2CCO.The spectra, which beyond the first structured ionization potential show a complicated series of bands in the 12-18-eV range, have been fully assigned by using calculations employing perturbation corrections to Koopmans' theorem.