Chemical bond in FmO2

The density of electronic states and the XPS spectrum of FmO2 valence electrons in the binding energy range from 0 to ∼40 eV have been calculated by the fully relativistic method of discrete variation. It is shown that the electrons of the outer and inner valence molecular orbitals (MOs) with binding energies from 0 to ∼15 eV and from ∼15 to ∼40 eV, respectively, contribute to the complex structure of the XPS spectrum of FmO2. The FmO2 MO diagram was constructed and the contribution of the electrons of the outer and inner valence MOs to the chemical bond was estimated.