Physisorption of metal carbonyls on Cu(100) |
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| Institution: | 1. CEMS, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan;2. Nonlinear Physics Centre, RSPE, The Australian National University, Canberra, ACT 00200, Australia;3. CFTP, Instituto Superior Técnico, Universidade de Lisboa, Lisbon 1049-001, Portugal;4. EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium;5. School of Physics and Astronomy, Monash University, VIC 3800, Australia;6. The Institute of Optics, University of Rochester, Rochester, NY 14627, USA;7. TU Wien, University Service Centre for Electron Microscopy, Wiedner Hauptstrasse 8-10, A-1040 Vienna, Austria;8. Physics Department, University of Michigan, Ann Arbor, MI 48109-1040, USA;1. Department of Microsystems Engineering, Rochester Institute of Technology, Rochester, NY, 14623, United States;2. NanoPower Research Laboratories, Rochester Institute of Technology, Rochester, NY, 14623, United States;3. Department of Chemical Engineering, Rochester Institute of Technology, Rochester, NY, 14623, United States;4. Center for Imaging Science, Rochester Institute of Technology, Rochester, NY, 14623, United States;5. Department of Electrical and Microelectronic Engineering, Rochester Institute of Technology, Rochester, NY, 14623, United States;6. Electronics Science and Technology Division, United States Naval Research Laboratory, Washington, DC, 20375, United States;1. Dept. of Materials Science & Engineering, North Carolina State University, Raleigh, NC, 27695, USA;2. Nottingham Applied Materials and Interfaces (NAMI) Group, GSK Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, Nottingham, NG7 2TU, UK;1. School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom;2. School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom;3. AstraZeneca, Oral Product Development, Pharmaceutical Technology & Development, Operations, Macclesfield, SK10 2NA, United Kingdom;1. School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK;2. School of Chemistry, University of Nottingham, Nottingham, NG7 2RD, UK;3. School of Veterinary Medicine and Sciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK;4. Department of Mathematics and Applied Mathematics, University of Johannesburg, Aukland Park Kingsway Campus, Rossmore, Johannesburg, South Africa;1. Laboratory of Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland;2. Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland;3. Institute for Quantum Life Science, National Institutes for Quantum Science and Technology, 4-9-1, Anagawa, Inage-Ku, Chiba 263-8555, Japan;4. Takasaki Advanced Radiation Research Institute, National Institutes for Quantum Science and Technology, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan;5. JST, PRESTO, Kawaguchi, Japan |
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| Abstract: | Chromium hexacarbonyl (Cr(CO)6) and cyclopentadienyl rhodium dicarbonyl ((η5 − C5H5)Rh(CO)2) were physisorbed on the Cu(100) surface and their molecular orientations were deduced from their reflection-absorption infrared (RAIR) spectra. No thermal decomposition of the compounds was observed. Physisorbed Cr(CO)6 exhibited a substantial degree of dipole-dipole coupling within the adlayer, which was successfully disrupted by coadsorption in Ar at 23 K. The large absorption coefficient of the T1u mode and the different boundary conditions of this ultrathin layer on a surface resulted in the observation of the longitudinal optical mode, confirming that the molecule is oriented with one carbonyl group adjacent to the surface. A Lyndane-Sachs-Teller splitting of 75 cm−1 was observed for the T1u mode. The physisorbed layer of (η5 − C5H5)Rh(CO)2 did not exhibit strong dipole-dipole coupling, and was oriented with the C5H5 (Cp) ring parallel to the surface. |
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