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CO Blocking of D2 Dissociative Adsorption on Ru(0001) |
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| Authors: | Hirokazu Ueta Irene M N Groot Michael A Gleeson Dr Steven Stolte Prof Dr George C McBane Prof Dr Ludo B F Juurlink Dr Aart W Kleyn Prof Dr |
| Institution: | 1. FOM Institute for Plasma Physics Rijnhuizen, Association Euratom‐FOM, P.O. Box 1207, 3430 BE Nieuwegein (The Netherlands), Fax: (+31)?30‐6096999;2. Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden (The Netherlands);3. Laser Centre and Department of Physical Chemistry, Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam (The Netherlands);4. Institute of Atomic and Molecular physics Jilin University, Changchun 130012 (China);5. Department of Chemistry, Grand Valley State University, Allendale, MI 49401 (USA) |
| Abstract: | The influence of pre‐adsorbed CO on the dissociative adsorption of D2 on Ru(0001) is studied by molecular‐beam techniques. We determine the initial dissociation probability of D2 as a function of its kinetic energy for various CO pre‐coverages between 0.00 and 0.67 monolayers (ML) at a surface temperature of 180 K. The results indicate that CO blocks D2 dissociation and perturbs the local surface reactivity up to the nearest‐neighbour Ru atoms. Non‐activated sticking and dissociation become less important with increasing CO coverage, and vanish at θCO≈0.33 ML. In addition, at high D2 kinetic energy (>35 kJ mol?1) the site‐blocking capability of CO decreases rapidly. These observations are attributed to a CO‐induced activation barrier for D2 dissociation in the vicinity of CO molecules. |
| Keywords: | carbon monoxide deuterium adsorption ruthenium surface chemistry |