Comments on "Significant differences between Hartree-Fock and local-exchange energy bands for TiO"

The recent controversy over the bonding in TiO, particularly with respect to $\mathrm{O}-2p-\mathrm{Ti}-3d$ band overlap, is reexamined. The soft-x-ray emission spectra (SXS) are recalculated within the $X\alpha$ formalism and agree well with experimental results. The x-ray photoemission spectroscopy (XPS) data are discussed and it is found that discrepancies between theory and experiment exist for both the $X\alpha$ and Hartree-Fock calculations. From the SXS and XPS spectra it is concluded that the $\mathrm{O}-2p-\mathrm{Ti}-3d$ mixing is better represented by the $X\alpha$ band structure.