Dresden 2020 – scientific programme
The DPG Spring Meeting in Dresden had to be cancelled! Read more ...
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 53: Poster Session - Oxides and Insulators: Adsorption and Reaction of Small Molecules
O 53.2: Poster
Tuesday, March 17, 2020, 18:15–20:00, P2/1OG
IRRAS study of CO adsorption on the calcite (10.4) surface — Weijia Wang, •Alexei Nefedov, Stefan Heissler, Yuemin Wang, and Christof Woell — Karlsruhe Institute of Technology, Institute of Functional Interfaces, Eggenstein-Leopoldshafen, Germany
The atomic structure of natural cleavage (10.4) calcite surface is a precondition to gain an understanding of its surface properties. To date, the atomic-level understanding of the structure is still under controversy. Therefore, in the present investigation, the (10.4) calcite surfaces were explored by the FTIR Spectroscopy with polarized infrared light in an ultrahigh vacuum (UHV) apparatus with the use of CO as a probe molecular. In order to achieve clean (10.4) calcite surface in UHV, dedicated devices (wobble stick, sample holder) are designed to perform the UHV cleavage. At low exposure, the adsorption of CO on the fresh cleaved (10.4) calcite surface at relatively low temperature of 62 K leads to a sharp negative C-O stretching band located at 2175.8 cm−1 using the p-polarized infrared light. This band represents a coverage-induced frequency redshift trend before reaching to the saturated coverage. This observation provides the direct spectroscopic evidence that the cleaved calcite surface is a well-ordered surface.