Journal of Chemical Physics, Vol.100, No.10, 7093-7100, 1994
A Comparison of Photoelectron-Spectroscopy and 2-Photon Ionization Spectroscopy - Excited-States of Au-2, Au-3, and Au-4
Photoelectron spectra of Au-n(-) with n = 2-4 are reported. Due to the relatively high photon energy used in our experiment (h nu = 6.424 eV) and the energy resolution of about 50 meV, various transitions into excited states of the neutral clusters are resolved. It is demonstrated that photoelectron spectra can serve as a map of the electronic states of a cluster, while the high resolution of the resonant two-photon ionization (R2PI) method gains information about the symmetry of the states. The comparison with similar data of Ag-n(-) clusters indicates the influence of relativistic effects and the large spin-orbit splitting for Au.
Keywords:METAL CLUSTER ANIONS;POTENTIAL-ENERGY SURFACES;RARE-GAS MATRICES;ELECTRONIC STATES;PHOTODETACHMENT SPECTROSCOPY;COPPER CLUSTERS;OPTICAL-SPECTRA;JELLIUM MODEL;GOLD CLUSTERS;AU2