COMBINED EXPERIMENTAL AND COMPUTATIONAL INVESTIGATION OF THE DOUBLE-IONIZATION OF (CH3)(4)M MOLECULES (M=SI, GE, SN AND PB)

The double-ionization energies of four (CH3)(4)M molecules (M = Si, Ge , Sn and Pb) to triplet electronic states of their dications have been calculated using a modified MSX alpha method. The results are used to interpret the peak positions in experimental spectra obtained by the application of double-charge-transfer spectroscopy to the molecules. A lthough the density of states is high, the main features of the spectr a correlate well with the calculated average double-ionization energie s to selected groups of states.