COMPARISON OF PHOTOELECTRON-SPECTRA OF CU-N(-), AG-N(-), AND NA-N(-) - MOLECULAR-ORBITALS VERSUS ELECTRONIC SHELLS

The photoelectron spectra of Ag-n(-) (n = 2-21) clusters are compared to the results of quantum-chemical ab-initio calculations (n = 2-9) an d to the predictions of the shell model. The shell model yields qualit ative assignments of the dominant features in the spectra to photoemis sion from occupied electronic shells. These correspond to the exact qu antitative assignments to transitions into various electronic states o f the neutral clusters according to the quantum-chemical calculations. The photoelectron spectra of Cu-n(-) and Na-n(-) (n = 3, 5, 7) cluste rs exhibit certain similarities to the Ag data in agreement with the b asic idea of the shell model.