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The Hartree-Fock (HF) method, supplemented by low-order Moller-Plesset (MP2)perturbation theory, has been utilized to predict the nuclear geometry,assuming planarity, of a low-lying isomer of the free space cluster BOSi$_2$.The planar structure found at equilibrium geometry is shown to be stableagainst small amplitude molecular vibrations. Finally, some brief comments aremade on the possible relevance of the above free-space cluster geometry to theknown B-O defects which limit the improvement of minority carrier lifetime in aform of p-type silicon.

Structure of a low-lying isomer of BOSi$_2$, as a free-space planar cluster, using the Hartree-Fock method plus second order perturbations