Electron correlation effects in the valence shell photoelectron spectra of haloethenes

Calculations have show that ionization from the inner valence shells of haloethenes cannot be treated on a one-electron basis and that photoelectron spectra should show additional bands corresponding to final ionized states of mixed character. The spectra of a range of haloethenes have been recorded using synchrotron radiation with photon energies of up to 75 eV and the inner valence shell spectra have been shown to be in good agreement with predictions. The measurements have also been used to extend existing photoelectron assignments providing complete valence shell assignments for the molecules studied.