PHOTOELECTRON-SPECTROSCOPY OF CU-N(-) CLUSTERS - COMPARISON WITH JELLIUM MODEL PREDICTIONS

We present a comparison of the electronic level structure of Cu(n)- cl usters with the jellium model using photoelectron spectroscopy of meta l cluster anions. The spectra are recorded at an energy resolution of 30 meV using photon energies of up to 6.4 eV. We obtain a well resolve d picture of the electronic structure of the 4s derived electronic sta tes in the energy region between the localized 3d derived states and t he highest occupied molecular orbital. The observed features can be as signed to the 1s, 1p, and 1d shells predicted by the jellium model if ellipsoidal distortions and effects like shake-up processes, multiplet splittings and the s-d hybridization are taken into consideration.