Abstract
In this communication we report a vibrationally resolved photoelectron spectrum of a relatively complex cluster, Si{sub 3}O{sub 4}{sup -}, for which we observe a single vibrational progression with a frequency of 800(50) cm{sup -}. We use quantum mechanical calculations to determine the structure of the cluster, which is found to be D{sub 2d} for the neutral ground state Si{sub 3}O{sub 4} and C{sub 2v} for Si{sub 3}O{sub 4}{sup -}. The agreement between the theoretical and experimental vertical and adiabatic detachment energies of the predicted Si{sub 3}O{sub 4}{sup -} geometry and the frequency and symmetry of the vibrations of Si{sub 3}O{sub 4}, suggest that the predicted structure is correct. 19 refs., 2 figs., 1 tab.
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