Adsorption dynamics for the system hydrogen/palladium and its relation to the surface electronic structure |
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| Institution: | 1. Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria;2. Max-Planck-Institut für Plasmaphysik, EURATOM-Association, D-85740 Garching, Germany;1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;2. Nanjing AIREP Environmental Protection Technology Co., Ltd, Nanjing 210091, China;3. Department of Materials Science and Engineering, University of Michigan, Ann Arbor 48109, USA;1. Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia;2. Drug and Herbal Research Center, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia;3. Scientific Chairs Unit, Taibah University, PO Box 30001, 41311 Madinah al Munawarah, Saudi Arabia;1. Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, via Cozzi 55, 20125 Milano, Italy;2. Institut Laue-Langevin, 71 avenue des Martyrs, 38000 Grenoble, France;3. Dipartimento di Fisica, Università di Roma Tor Vergata, via della Ricerca Scientifica 1, 00133 Roma, Italy;4. ENEA, Dipartimento Fusione e Tecnologie per la Sicurezza Nucleare, via Fermi 45, 00044 Frascati, Italy;1. Plasma Nanoscience Laboratories, Manufacturing Flagship, Commonwealth Scientific and Industrial Research Organisation (CSIRO), P.O. Box 218, Lindfield, NSW 2070, Australia;2. School of Physics, University of Melbourne, Parkville, VIC 3010, Australia;3. Plasma Nanoscience, School of Physics, The University of Sydney, Sydney, NSW 2006, Australia;4. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People''s Republic of China;5. Nanotechnology & Integrated Bio-Engineering Centre (NIBEC), University of Ulster, BT37 0QB, UK;6. School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia |
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| Abstract: | We have determined differential sticking coefficients for a monoenergetic nozzle beam of hydrogen on Pd(111) and Pd(110). In particular the energy dependence and the angular variation of the initial sticking coefficient were measured. The results indicate that adsorption of hydrogen on palladium occurs in parallel processes through a direct path with an activation barrier of perhaps 50 meV or less and a precursor path. There is relatively little difference in the adsorption properties of the (111) and the (110) plane. The appearance of a molecular precursor on the (111) plane can be related to the electronic structure of palladium, in particular to the absence of occupied Shockley surface states, as compared to Ni (111) and Pt (111). Pre-adsorbed potassium on a (110) plane acts as an inhibitor to adsorption. Different inhibiting mechanisms are observed for the direct adsorption path and the precursor path. At high potassium coverage the precursor path is completely suppressed. |
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