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The form and electronic structure of the valence band (VB) of the ferroelectric SbSI crystal was calculated by solving the Hartree-Fock-Roothaan matrix equation. The diagonal eigenvalue matrix ε gives the electron state energies. These energies were also studied experimentally by PHI 5700 / 660 Physical Electronics Spectrometer using Al Kα monochromatic radiation (1486.6 eV) as the excitation source. The spectrum of the VB electronic levels was approximated by the Gauss functions. The form ofdoi:10.3952/lithjphys.46206 fatcat:uf3c47ryarg7hpdb5mus64hase