Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 54: Poster Session - Semiconductor substrates: Adsorption and Reaction of Small Molecules
O 54.2: Poster
Tuesday, March 17, 2020, 18:15–20:00, P2/1OG
Controlled Manipulation of Diethyl Ether on Si(001)via Tip-Induced Electronic Excitation — •Alexa Adamkiewicz1, Gerson Mette1, Tamam Bohamud1, Michael Dürr1,2, and Ulrich Höfer1 — 1Fachbereich Physik, Philipps-Universität Marburg, Germany — 2Institut für Angewandte Physik, Justus-Liebig-Universität Giessen, Germany
Tip-induced electronic excitation via STM can give access to alternative reaction channels beyond thermal activation. Recently, 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 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 Et2O and THF. These differences do not only represent the influence of the different molecular structures of the adsorbates, but also provide insight with respect to the influence of the local electronic structure of the substrate on the reaction and the competition between electronic structure and steric constraints.
[1] G. Mette et al. Angew. Chem. Int. Edit. 58, 3417 (2019).