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O: Fachverband Oberflächenphysik
O 23: Poster: Surface Reactions
O 23.4: Poster
Monday, March 27, 2023, 18:00–20:00, P2/EG
On-Surface Collision Reactions — •Matthew James Timm1, Stefan Hecht2, and Leonhard Grill1 — 1Institute of Chemistry, University of Graz, Heinrichstraße 28, 8010 Graz, Austria — 2Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany
Collisions between atoms and molecules are required to form chemical bonds, and thus lie at the heart of chemistry. Their outcome depends on several parameters: the collision energy, the miss-distance between the centers of the colliding species (the impact parameter), and on the relative alignment of reagents. Studying such reactions on a surface provides a 2D confinement and allows single-molecule imaging by scanning probe microscopy. For surface reactions, it has been demonstrated that the impact parameter can be selected using a 'surface-molecular-beam' of energetic CF2 'projectiles' on a Cu(110) surface [1-2]. The inherent corrugation of Cu(110) collimates the projectiles, allowing them to be aimed at nearby molecular 'targets' at chosen impact parameters. However, the relative alignment of reagents could not be varied until now, due to the singular possible adsorption configurations of the studied targets. Here, a singly-debrominated molecular target has been chosen as it can adopt multiple adsorption alignments relative to the incoming CF2 projectile, thus providing the missing element required for a more general selection of collision geometry. [1] Anggara, K.; Leung, L.; Timm, M. J.; Hu, Z.; Polanyi, J. C.; Sci Adv., 2018, 4, eaau2821. [2] Anggara, K.; Leung, L.; Timm, M. J.; Hu, Z.; Polanyi, J. C.; Faraday Discuss., 2019, 214, 89-103.