Experiment and DFT calculated VtC XES of [(Me3TACN)2Cu2(µ-O)2]2+ (top) with individual transitions (grey sticks, multiplied by a factor of 5). The corresponding molecular orbitals of numbered transitions are depicted (bottom) with an isosurface value σ = 0.07, except transition 1 at σ = 0.10. The calculated spectrum has a uniform 3.5 eV Gaussian broadening and a 230.2 eV shift. Alpha MO, pink; beta MO, purple; copper, cyan; nitrogen, blue; oxygen, red; carbons, black; hydrogens omitted.