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He(I)-PE-spectra of perchlorocyclopolysilanes (SiCl2)4, (SiCl2)5 and (SiCl2)6 are recorded and interpreted by semiempirical PM3 calculations. HOMOs may be described by antibonding π∗ interactions of σ{SiSi)3p and (Cl)3p lone pair orbitals. First ionization potentials appear near 9 eV and increase in the order Si4 < Si6 < Si5. HOMO-LUMO studies suggest, that intramolecular charge transfer might be responsible for the unusual low energy of UV absorption bands.
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