Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 90: Surface Dynamics: Experiments
O 90.1: Vortrag
Donnerstag, 23. März 2017, 10:30–10:45, WIL C107
Adsorption Dynamics of Methanol on Si(001) Studied by Means of Molecular Beam Techniques — •Tamam Bohamud1, Marcel Reutzel1, Michael Dürr1,2, and Ulrich Höfer1 — 1Philipps-Universität, 35037 Marburg — 2Justus-Liebig-Universität, 35392 Giessen
Understanding the reaction of organic molecules on semiconductor surfaces is a fundamental step on the way to hybrid structures with high functionality. For this reason, the adsorption of organic molecules with different functional groups on silicon surfaces has been studied in detail. In most cases, the adsorption dynamics are governed by a metastable intermediate state [1,2]. For methanol, such an intermediate state was also proposed but could not be observed experimentally
yet.
In this contribution, we make use of molecular beam experiments to investigate the adsorption dynamics of methanol on Si(001). The initial sticking probability s0 was measured both as a function of surface temperature and kinetic energy of the impinging molecules. It was found that s0 decreases with increasing surface temperature, indicating adsorption via an intermediate state. The dependence of s0 on the kinetic energy of the incoming molecules deviates from a simple non-activated adsorption behavior. This is discussed both in terms of strong coupling between intermediate and final state as well as in terms of additional reaction channels accessible at higher kinetic energy.
[1] M. Lipponer et al., Chem. Phys. Lett. 624, 69 (2015)
[2] M. Lipponer et al., Surf. Sci. 651, 118 (2016)