  Motivated by the theoretical study of Saito and Ono (2011) on three
crystalline forms of SiO2 under pressure, quantum-chemical calculations on
various 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 and
equilibrium bond lengths. Coupled clusters and correlation-corrected MP2
calculations are presented. For the cations, we emphasize especially the
structural distortions occurring in removing degeneracies.
