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O: Fachverband Oberflächenphysik
O 57: Focus Session: Semiconductor Surface Chemistry – from Reaction Mechanisms to Well-Ordered Interfaces II
O 57.2: Vortrag
Mittwoch, 29. März 2023, 15:30–15:45, GER 38
Controlling tip-induced reaction products of surface-adsorbed organic species on Si(001) — •Alexa Adamkiewicz1, Tamam Bohamud1,2, Marcel Reutzel1, Gerson Mette1, Ulrich Höfer1, and Michael Dürr1,2 — 1Department of Physics, Philipps University Marburg, Germany — 2Institute of Applied Physics, Justus Liebig University Giessen, Germany
Tip-induced electronic excitation via STM can give access to alternative reaction channels beyond thermal activation. We showed for the cleavage of tetrahydrofuran (THF) on Si(001) that excitation by the tunneling electrons leads to new final products, which can be selectively addressed by the type of excitation [1]. Here, we present the influence of the detailed configuration of the organic adsorbates on tip-induced ether cleavage. Due to the linear molecular structure of diethyl ether (Et2O), the adsorbates undergo fragmentation when cleaved, thus leading to a higher degree of freedom compared to the ring-shaped THF. The final products differ significantly for both species. Furthermore, we show that upon high voltage scans, covalently bound Et2O fragments can be further reacted into more complex configurations which are thermally not accessible [2].
[1] Mette et al., Angew. Chem. Int. Edit. 58, 3417 (2019).
[2] Adamkiewicz et al., J. Phys.: Condens. Matter 33, 344004 (2021).