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Influence of the geometric structure on the V L3 near edge X-ray absorption fine structure from vanadium phosphorus oxide catalysts
Affiliation:1. National Laboratory Astana, 53 Kabanbay Batyr St., 010000 Astana, Kazakhstan;2. National Research Tomsk Polytechnic University, 30 Lenin ave., 634050 Tomsk, Russia;3. International Academy of Optoelectronics at Zhaoqing, South China Normal University, Liyuan Street, 526238 Guangdong, China;4. Indira Gandhi Center for Atomic Research, Metallurgy and Materials Group, Kalpakkam,603102 Tamil Nadu, India;5. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany;6. Optotransmitter-Umweltschutz-Technologie e.V., 325 Köpenicker Str., 12555 Berlin, Germany;1. Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France;2. Université Bordeaux, ISM, UMR 5255, F-33400 Talence, France;3. CNRS, ISM, UMR 5255, F-33400 Talence, France;4. Aix-Marseille Univ, CNRS UMR 7341, LP3, Marseille, France;5. Aix-Marseille Univ, CNRS UMR 7325, CINaM, Marseille, France;6. Institut des Nanotechnologies de Lyon – Université de Lyon, UMR 5270 – CNRS, Ecole Centrale de Lyon, F-69134 Ecully Cedex, France;7. Université de Limoges, CNRS, ENSCI, UMR 7315, F-87000 Limoges, France;1. Nanotechnology Research Laboratory, Department of Physics, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia;2. Department of Physics, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia;3. Department of Physics, Faculty of Education at Al-Mahweet, Sana''a University, Al-Mahweet, Yemen;4. Department of Physics and Basic Sciences, Faculty of Engineering Technology, Al-Balqa Applied University, Amman, Jordan;5. Jordan Atomic Energy Commission, Nuclear Seiences and Aplications Commission, Amman, Jordan;1. Department of Physics, Presidency College, Chennai 600005, India;2. St. Peter''s University, Avadi, Chennai 54, India
Abstract:We present the V L3 near edge X-ray absorption fine structure (NEXAFS) of a vanadium phosphorus oxide (VPO) catalyst. The spectrum is related to the V3d–O2p hybridised unoccupied states. The overall peak position at the V L3-absorption edge is determined by the formal oxidation state of the absorbing vanadium atom. Details of the absorption fine structure are influenced by the geometric structure of the compound. Empirically we found a linear relationship between the energy position of several absorption resonances and the V–O bond length of the participating atoms. This allows identification of the contribution of specific V–O bonds to the near edge X-ray absorption fine structure. The bond length/resonance position relationship will be discussed under consideration of relations between geometric structure and NEXAFS features observed in X-ray absorption experiments and theory.
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