Coupled harmonic oscillator models of carbon monoxide adsorbed on stepped,platinum surfaces |
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| Institution: | 1. Department of Civil and Materials Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA;2. Institute of Nanotechnology and Physical Engineering, Berdyansk State Pedagogical University, 71100 Berdyansk, Ukraine;2. Department of Cardiology, Chang Gung Memorial Hospital, Taoyuan, Taiwan;3. Division of Thoracic and Cardiovascular Surgery, Chang Gung Memorial Hospital, Taoyuan, Taiwan;4. Institute of Hospital and Health Care Administration, National Yang-Ming University, Taipei, Taiwan;1. College of Chemical Engineering, Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, Nanjing Forestry University, Nanjing 210037, China;2. Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore;3. School of Chemistry, Monash University, Clayton 3800, Victoria, Australia;4. Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China;5. State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao, China;1. Department of Emergency Medicine, Division of Emergency Ultrasound, Mount Sinai St. Luke''s Hospital, Mount Sinai West Hospital, New York, New York;2. Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, New York;1. Institut für Theoretische Physik, ETH Zurich, CH-8093 Zürich, Switzerland;2. Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany;1. College of Applied Sciences & Beijing Engineering Research Center of Precision Measurement Technology and Instrument, Beijing University of Technology, Beijing 100124, China;2. The Pilot College of Beijing University of Technology, Beijing 101101, China |
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| Abstract: | Harmonic oscillator models are used to explain recent experimental data on infrared absorption by CO molecules adsorbed on two stepped platinum surfaces. These data reveal only a lower frequency band at low coverage and only a higher frequency band at high coverage. Both bands exist over a range of intermediate coverages. The data are explained by a coupled-dipole model which includes the effects of electronic polarizability, the tilted orientation of CO molecules at step sites, and the electric field enhancement at step sites. The lower-frequency band is associated with CO molecules adsorbed on step sites and the higher-frequency band is associated with two-dimensional islands consisting of both step and terrace CO. The model explains the observed variation of frequency and intensity with coverage for CO adsorption on Pt(533) and Pt(432) surfaces. The model calculations indicate that the wavenumber for a single, linearly bonded CO molecule is about 9 cm−1 higher on a terrace site than on a step site. |
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