Fig. 7. Plots of the deformation densities Δρ (isocontour 0.002 a.u.) of the pairwise σ orbital interactions between the argon and boron oxide cations in the [ArB₃O₄]⁺, [ArB₃O₅]⁺, [ArB₄O₆]⁺ and [ArB₅O₇]⁺ cations and the pairwise interaction orbitals, the LUMO of bare cations and HOMO of the argon atom. The orbital interaction energies and the fragments’ orbital energies were calculated at the BP86/TZ2P level. The charge flow of the σ orbital interactions is red to blue.