Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 14: Surface Chemical Dynamics

O 14.8: Vortrag

Montag, 7. März 2016, 17:00–17:15, S053

Reaction mechanisms by direct imaging of individual intermediates stabilized by surface dissipation and entropy — •Alexander Riss^1,2, Alejandro Pérez Paz³, Sebastian Wickenburg^2,4, Hsin-Zon Tsai², Dimas G. de Oteyza^5,6, Angel Rubio^9,10,3, Felix R. Fischer^4,7,8, and Michael F. Crommie^2,4,8 — ¹Physik-Department E20, Technische Universität München, Germany — ²Department of Physics, UC Berkeley, USA — ³Nano-Bio Spectroscopy Group and ETSF, Universidad del País Vasco, CFM CSIC-UPV/EHU-MPC & DIPC, San Sebastián, Spain — ⁴Materials Sciences Division, LBNL, Berkeley, USA — ⁵Donostia International Physics Center, San Sebastián, Spain and Ikerbasque, Basque Foundation for Science, Bilbao, Spain — ⁶Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, San Sebastián, Spain — ⁷Department of Chemistry, UC Berkeley, USA — ⁸Kavli Energy NanoSciences Institute at the UC Berkeley and the LBNL, Berkeley, USA — ⁹Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — ¹⁰CFEL, Hamburg, Germany

We have directly determined the microscopic mechanisms underlying complex bimolecular coupling and cyclization reactions of enediynes through real-space imaging of the precise bond configuration of intermediate species using noncontact atomic force microscopy (nc-AFM). Supported by extensive theoretical calculations, we reveal that the observed transient intermediates along the reaction pathway are stabilized by efficient energy dissipation to the substrate and changes in molecular entropy along the reaction pathway.