Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 15: Metal Substrates II: Adsorption and Reactivity

O 15.5: Talk

Monday, April 1, 2019, 16:00–16:15, Kunsthalle

Properties of Adsorbed Solvent Molecules: Adsorption Strength and Structure of CDCl₃ on Ag(111) — •Marvin Quack and Karina Morgenstern — Chair of Physical Chemistry I, Ruhr-University of Bochum, Germany

Characterizing the adsorption processes of solvent molecules on metal surfaces and the fundamental understanding of surface-adsorbate interactions play an important role, as for example in electrochemical cells or solid state catalysts. In order to understand the process of adsorption of solvent molecules, we investigated chloroform (CDCl₃) supported on a Ag(111) single crystal surface by means of temperature programmed desorption (TPD) and low-temperature scanning tunneling microscopy (LT-STM) in ultra high vacuum. The TPD spectra reveal the desorption of molecular chloroform below 180 K, indicating a physisorbed species. The STM results show the formation of a (2x2) superstructure at coverages lower than 1 ML of CDCl₃. At higher coverage, we observe the growth of 1D-crystallites in the second layer following the high symmetry directions of the substrate. Further STM results and a model for the adsorption will be presented in this talk.