UV laser-stimulated resonant desorption from metal surfaces: NO/Ni(100) |
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| Institution: | 1. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China;3. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;4. Department of Materials Science and Engineering, City University of Hong Kong, Kowloon 999077, Hong Kong, China;5. College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, Guangdong, China;6. Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China;7. Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, United States;1. State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China;2. Key Laboratory of Networked Control System, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China;3. Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang 110169, China;4. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | NO chemisorbed on a Ni(100) surface at 170 K, has been desorbed with UV laser light (ArF, 193 nm = 6.42 eV) in the energy range of the most intense electronic absorption of the NO/Ni(100) system. The rotational and vibrational state distribution of the desorbing molecules is probed via laser-induced fluorescence. The desorbing molecules are vibrationally and rotationally excited. The rotational distribution is markedly non-Boltzmann. The velocity distributions are narrow and very different for various rotational states. They cannot be fitted to a Maxwell distribution. We believe that these results provide evidence for the resonant nature of the light-absorption-desorption process for NO on a Ni(100) surface. |
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