HEI AND HEII PHOTOELECTRON STUDY OF N2O4

A 304 Å Hell photoelectron spectrum of N2O4 in the gaseous phase has been deduced in the region up to 29 eV from a Hell spectrum of NO2-N2O4 mixture obtained with a nozzle beam technique, indicating three new maxima in the region between 20 and 29 eV. A 584 Å Hel spectrum of N2O4 was also obtained here. From a comparison of the Hel and Hell spectra of N204 below 20 eV, it was confirmed that two ionization bands exist at 16.5 and 18.2 eV which appear as shoulders in the Hell spectrum. At least fourteen ionization bands have been identified from the Hell spectrum in the region studied. The thirteen bands below 24 eV have been assigned on the basis of a recent Green's function study of von Niessen et al.