Abstract
A new Si x O y species has been isolated in argon matrices at low temperatures by Roy et al. [J. Chem. Phys. 104 (1996) 8]. The new species was characterized by vibrational spectra and proposed to be SiO 3 in a C 2v structure, with an unusual O–O bond. To explore this structure, we use the CCSD(T), QRHF-CC, EOM-CC, IP-STEOM and the DIP-STEOM method to investigate SiO 3 and its anion. The IP-STEOM and DIP-STEOM schemes allows us to describe traditional multi-reference situations in what is conceptionally a one determinantal frame work. Our results support the experimentally found C 2v structure.
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