Analysis of the Auger-photoelectron coincidence spectroscopy (APECS) spectra of metallic Pd,Ag, and Sn |
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| Institution: | 1. Materials and Electronic Systems Laboratory (LMSE), University of Bordj Bou Arreridj, Algeria;2. Université Bordeaux 1, CNRS/IN2P3, Centre d’Etudes Nucléaires de Bordeaux-Gradignan, CENBG, France;3. Laboratory of Materials Physics and Its Applications, University of M''sila, 28000 M''sila, Algeria;1. Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, D-52425 Jülich, Germany;2. Centro Atómico Bariloche, 8400 – San Carlos de Bariloche, Argentina;3. Department of Chemistry, Universidad Nacional de Río Cuarto, X5804BYA Río Cuarto, Argentina;1. Department of Chemical Engineering and Environmental Technology and Institute of Nanoscience of Aragon (INA), University of Zaragoza, C/Poeta Mariano Esquillor S/N, 50018 Zaragoza, Spain;2. CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Campus Río Ebro-Edificio I+D, C/Poeta Mariano Esquillor S/N, 50018 Zaragoza, Spain;3. Instituto de Carboquímica, Consejo Superior de Investigaciones Científicas (ICB-CSIC), C/Miguel Luesma Castán 4, Zaragoza 50018, Spain;1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, People''s Republic of China;2. Division of Advanced Materials Engineering, Hydrogen & Fuel Cell Research Center, Chonbuk National University, Jeonju 561-756, South Korea;3. Department of Chemistry, The University of Oslo, 0349 Oslo, Norway;1. BAM – Federal Institute for Materials Research and Testing, Unter den Eichen 44-46, 12203, Berlin, Germany;2. Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany |
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| Abstract: | The M45-level photoelectron spectrum of Ag metal measured in coincidence with the M45–VV(1G) Auger-electron line is analyzed by taking into account the possibility of the M4–M5–VV Coster–Kronig (CK)-transition preceded Auger transition. We denote the atomic shells Mx(Mxy) and Nxy (x, y = 4,5) by MX(MXY) and V, respectively. The M4–M5 CK-transition rate is very small. The M45–VV Auger-electron spectra of metallic Pd and Sn measured in coincidence with the M4 (or M5)-level photoelectron line are analyzed. The M4–M5 CK-transition rates are also very small in metallic Pd and Sn. The coincidence Auger-electron line previously interpreted as the M4–M5–VV (or M4–M5V–VVV) Auger-electron line is largely due to the inelastically scattered M5-level photoelectron background beneath the M4-level photoelectron line. The APECS spectrum of Pd metal shows the first evidence of the M5V–VVV transition of the localized M5V shakeup two-hole state. The intensity ratio of the inelastically scattered Auger-electron background to the M5–VV Auger-electron main line of Ag metal measured in coincidence with the inelastically scattered M5-level photoelectron background beneath the M4-level photoemission line increases, as compared to that measured in coincidence with the M5-level photoelectron main line. This is because when the probability of the photoelectron being inelastically scattered increases, that of the Auger electron emitted by the same ionized atom, being inelastically scattered increases. In other words the photoelectrons and the Auger electrons are originated from the deeper atomic sites (longer pathlength). |
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