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O: Fachverband Oberflächenphysik
O 99: Organic Molecules on Inorganic Substrates VI: Adsorption, Growth and Networks
O 99.8: Vortrag
Donnerstag, 19. März 2020, 12:30–12:45, GER 38
Molecule-Surface Collision Explores the Chemical and Conformation Space of a Molecule — •Kelvin Anggara — Max Planck Institute for Solid State Research, Stuttgart
Molecule-surface collision is fundamental in wide array of contemporary topics, ranging from material science to structural biology. From scattering experiments at gas-surface interface, much of the collision dynamics is known for diatomic molecules colliding with a surface - but not for polyatomics. Here, we study the dynamics of polyatomic-surface collision in vacuo by combining electrospray ionization and single-molecule microscopy. Using the electrospray ion-beam deposition (ES-IBD) technique, a beam of polyatomic ions was aimed normal to a metal surface with a known translational energy. The resulting collision outcome was imaged using Scanning Tunnelling Microscopy (STM) to allow inference of the collision dynamics. The key finding here is that, upon collision, the molecular translation is converted to low-frequency molecular vibrations, which consequently trigger: (i) a chemical reaction at 5 - 50 eV collision energy; or (ii) a conformation change at 0.5 - 5 eV. The former is exemplified by a Reichardt Dye colliding with a Cu(100) surface that gave a bond-selective reaction via mechanical compression of the whole molecule; While, the latter is exemplified by a Cellohexaose colliding with Cu(100) that resulted in an exploration of the conformation space, i.e. folding motifs, of the oligosaccharide. The general approach described here thus allows the use of molecule-surface collision as a means to explore different regions of potential energy surface for any molecule that can be electrosprayed.