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김일유,조은진 한국물리학회 2010 새물리 Vol.60 No.8
A solution energy term (Eimp) must be considered to explain the surface core-level shift (SCS)of photoemission spectroscopy (PES) (δ(PES)) for the occupied core-level of a Z-atom metal and the SCS of inverse photoemission spectroscopy (IPES) (δ(IPES)) for the unoccupied core-level of a (Z+1)-atom metal. In addition, the Coulomb interaction of surface atoms (US ff ) of Eu metal must be different from that of bulk atoms (UB ff ) of Eu metal to explain consistently the δ(PES) of Eu metal and the δ(IPES) of Gd metal.
Mixed Valency Study of Ce_(0.2)U_(0.8)Al_2
박경자,조은진,김일유,정진원,노한진,박제근 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.3
The Ce 3d core-level spectra and the unoccupied f spectral weights of (Ce_(1−x)U_x)Al_2 (x = 0, 0.2, and 0.8) compounds are measured with X-ray photoelectron spectroscopy and inverse photoelectron spectroscopy, respectively. By using the satellite intensities of the Ce 3d core-level spectra and the single-impurity Hamiltonian, we get the f electron numbers (n_f) of the (Ce_(1−x)U_x)Al_2 compounds. In particular, the fact that the n_f of Ce_(0.2)U_(0.8)Al_2 is 0.94 leads to the conclusion that Ce_(0.2)U_(0.8)A_2 is a mixed valent compound.
Correlation Study of a Beam-position Monitor and a Photon-beam-position Monitor in the PLS-II
김창범,신승환,황일문,이병준,주영도,하태균,윤종철,김경화,김문영,이은희,김일유,황정연 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.2
The beam stability is one of the most important issues for the user service of the synchrotronradiation facility. After the upgrade of the Pohang Light Source (PLS-II), the electron-beam orbitis maintained within a root-mean-squred (rms) 1-μm range by using an orbit feedback system. However, that does not guarantee the radiation stability at the end of the beamline because unknownfactors, such as focusing mirrors and double-crystal monocrometers, are present in the beamline. As a first step to solve this problem, photon-beam-position monitors (PBPMs) are installed in thefront ends of the beamline to monitor the radiation stability. If the radiation is stable at the startingpoint of the beamline, we can move to the other components downstream that make the radiationunstable. In this paper, a correlation study will be presented between the beam-position monitor(BPM) and the PBPM. In addition, the effect of the orbit feedback system on the correlation willbe described.