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The electronic structure of the $f$-based superconductor $\mathrm{CeIr_3}$was studied by photoelectron spectroscopy. The energy distribution of the$\mathrm{Ce}~4f$ states were revealed by the $\mathrm{Ce}~3d-4f$ resonantphotoelectron spectroscopy. The $\mathrm{Ce}~4f$ states were mostly distributedin the vicinity of the Fermi energy, suggesting the itinerant character of the$\mathrm{Ce}~4f$ states. The contribution of the $\mathrm{Ce}~4f$ states to thedensity of states (DOS) at the Fermi energy was estimated to be nearly half ofthat of the $\mathrm{Ir}~5d$ states, implying that the $\mathrm{Ce}~4f$ stateshave a considerable contribution to the DOS at the Fermi energy. The$\mathrm{Ce}~3d$ core-level and $\mathrm{Ce}~3d$ X-ray absorption spectra wereanalyzed based on a single-impurity Anderson model. The number of the$\mathrm{Ce}~4f$ states in the ground state was estimated to be $0.8-0.9$,which is much larger than the values obtained in the previous studies (i.e.,$0-0.4$).

Impact of the Ce $4f$ states in the electronic structure of the intermediate-valence superconductor CeIr$_3$