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Motivated by the theoretical study of Saito and Ono (2011) on threecrystalline forms of SiO2 under pressure, quantum-chemical calculations onvarious free-space clusters of SiOn and GeOn for 1 < n <= 6 are reported here.Both neutral and cationic clusters have been examined, for both geometry andequilibrium bond lengths. Coupled clusters and correlation-corrected MP2calculations are presented. For the cations, we emphasize especially thestructural distortions occurring in removing degeneracies.

Neutral and cationic free-space oxygen-silicon clusters SiOn (1 < n <= 6), and possible relevance to crystals of SiO2 under pressure