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O: Fachverband Oberflächenphysik
O 56: Metal Substrates II
O 56.2: Vortrag
Mittwoch, 20. März 2024, 15:15–15:30, MA 043
How to measure cones of reaction for single-molecule collisions — •Matthew James Timm1, Stefan Hecht2, and Leonhard Grill1 — 1Institute of Chemistry, University of Graz, Heinrichstraße 28/IV, 8010 Graz, Austria — 2Department of Chemistry & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany
Collisions between molecules are essential for chemistry, as they are required to form bonds. Their outcome depends on the collision energy, the relative alignment of reagents and on the impact parameter, which is the miss-distance between the centers of mass of the colliding species. Selection of impact parameter has been demonstrated for on-surface reactions by a "surface-molecular-beam" of CF2 projectiles, formed by dissociating CF3 molecules on a Cu(110) surface with a scanning tunneling microscope tip. These projectiles are directed along the underlying rows of Cu atoms toward a chemisorbed molecular target [1-2]. Control over the relative alignment of the target, however, has remained elusive so far. Here, a singly-debrominated molecular target has been chosen as it can adopt multiple possible adsorption alignments relative to the incoming CF2 projectile. This allows collision at a selected distance from, and alignment with, the center of mass of the target. Accordingly, it paves the way towards an unprecedented ability to map how collision geometry contributes to collision outcome. [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.
Keywords: surface-aligned-reaction; selected impact parameter; directed collision; single-molecules; scanning tunneling microscopy