[en] The Hiroshima Synchrotron Radiation Center is a common facility for both research and education in the field of synchrotron radiation science. The operation of the light source was started from March 1998. The storage ring can be operated at 700 MeV with a critical energy of 873 eV. The machine has a racetrack shape with a circumference of 22 m, and has 14 photon beam ports. The maximum operational current is 300 mA, and the beam lifetime is longer than 6 h at 200 mA. Of total 13 beamlines introduced so far, three beamlines are dedicated to photoemission spectroscopy (PES). An available photon-energy range is hν=26-300 eV. A hemispherical photoelectron analyzer is equipped at the end station. Total energy resolution has been achieved to ∼ 15 meV at hν=100 eV. The photon-energy range is hν=4-40 eV and total energy resolution is ∼ 4.5 meV at hν=7 eV. Although total energy resolution has been achieved to ∼25 meV at hν=80 eV, we usually carry out the PES experiments. The PES spectra taken at hν∼7 eV provide information on the conduction band electrons. In order to investigate the bulk-originated electronic structure we started the hard x-ray PES experiments with a total energy resolution of ∼ 270 meV. Thus, we promote the research project with use of light in a wide energy-range (7 eV-6 keV). 1) Unusual energy gap formation in the Kondo semiconductor CeRhAs has attracted much interest for its unusual energy gap formation or metal-to-insulator transition as temperature decreases. The energy gap is assumed to be formed by the temperature dependence of the c-f hybridization. By means of resonant PES, we could observe a energy-gap structure in the Ce 4f states. In order to observe As 4p state and Rh 4d state, we have measured the PES spectra at hν=7.9 eV, 40 eV and 6 keV, respectively, due to the photon-energy dependence of photoionization cross-section. From the spectra at hν=7.9 eV, we could see that the density of states (DOS) near E_F decreases with lowering temperature. The 40 eV spectrum, indicating Rh 4d partial DOS, shows energy gap structure near E_F. We can, thus, reveal behaviors of each orbital for the gap formation with use of the energy-dependent PES spectra. 2) Valence transition in YbInCu₄ has attracted great interests because of an isostructural first-order valence transition at T_V=42 K. In accordance with the valence transition, abrupt changes in the lattice volume, magnetic susceptibility and the other physical properties are observed. Thermodynamic data have shown that the Yb valence changes from z ∼ 3 to z ∼ 2.9, while Yb L_III-edge x-ray absorption spectroscopy experiments from z∼2.9 to z∼2.8. In order to investigate the change of the Yb 4f and conduction-band states near the valence transition, the PES spectra have been measured at hν=7 eV-6 keV. The spectra of YbInCu₄ measured at hν=21.2-180 eV show the peak-structure derived from the Yb²⁺ 4f_7/2 states at ∼ 39 meV below E_F, in spite of the Yb states close to trivalent in the high-temperature region. Although the peak intensity increases with lowering temperature. Actually, the PES spectra taken at hν=7 eV, which are bulk-sensitive compared to those at hν=21.2-180 eV and reflect conduction-band states exhibit a drastic change between 50 and 40 K. The spectral feature at the top 150 meV region is almost flat above 50 K. With lowering temperature to 40 K, the structure appears around 47 meV and the feature is unchanged down to 20 K. This experimental result shows that an amount of hybridization between the Yb 4f and conduction-band states abruptly increases in the low temperature phase and is consistent with the change of the Kondo temperature T_K in accordance with the valence transition; T_K+ ∼ 25 K and T_K- ∼ 400 K. In order to investigate the Yb 4f states under the bulk-sensitive condition, we have measured the PES spectra at hν = 6 keV. The intensity of the Yb²⁺ 4f-derived peak is negligibly small above 50 K and the peak is remarkably enhanced through the valence transition. Such a change of the valence-band PES spectra of YbInCu₄ has not been presented so far. With the increase of λ, the spectral feature changing becomes sharp and the Yb valence derived from the PES spectra becomes close to trivalent. The λ- dependent PES spectra suggest an existence of the subsurface region, where the transition temperature would be higher than that of the bulk, in YbInCu₄. 3) Many body effect in Ni(110) Metallic ferromagnetism of Ni has attracted much interest. Electron correlation plays an important role for the narrowing of the Ni 3d bands. In order to examine many body effects in the ferromagnetic Ni 3d bands, we have done high-resolution ARPES study of Ni(110) using hν = 21-29 eV. In the intensity plot of the ARPES spectra of Ni(110) taken at hν = 29 eV, the Σ₁ up- and down-spin bands crossing E_F are observed. From the width of an angular-distribution curve (ADC) at E_F we can estimate mean-free paths of quasi-particles at E_F with up- and down-spins. By quantitative line shape analyses, we found that up-spin electrons has shorter mean-free path compared with down-spin electrons. We could also evaluate the real and imaginary parts of the self-energy, in which information on the many body effects is included. We can, thus, discuss electronic structure by means of the high-resolution ARPES. An amount of information can be deduced from the high-resolution PES spectra. 4) Other than three subjects above mentioned, the PES results have been obtained for the carbon nanotubes, the Kondo semiconductor YbB₁₂, the superconducting interlayered nitrides β-HfNCl. In addition to PES, linear and circular dichroison experiments are available. Recently, we have measured the Ti 2p-3d absorption spectra of the Mott insulator YTiO₃. (author)