SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 6: New Methods: Experiments and Theory

O 6.1: Talk

Monday, March 27, 2023, 10:30–10:45, GER 39

A Newly Developed IRAS System to Investigate Adsorbates on Metal-Oxide Single Crystal Surfaces — •David Rath, Jiri Pavelec, Ulrike Diebold, Michael Schmid, and Gareth S. Parkinson — Institute of Applied Physics, TU Wien, Austria

The IRAS system GRISU (GRazing incident Infrared absorption Spectroscopy Unit) was developed to investigate adsorbates on metal oxide single crystals in the research field of single-atom catalysis [1]. It combines the commercially available FTIR spectrometer Bruker Vertex 80v with an UHV chamber [2]. The compact design requires only one CF150 port for the main optical components, features five mirrors for beam guidance placed in HV and UHV environment and optimises the system’s performance, flexibility, and usability. The result is a small controllable focal-spot diameter (max. 3 mm) on the sample, motorised optical components, and an aperture limiting the incidence angle range (variable, 49^∘ to 85^∘) on the sample. Based on ray tracing results and preliminary intensity measurements, the system shows up to 10× higher intensities compared to a commercial system with two parabolic mirrors with a focal length of 250 mm. First IR spectra measured with the recently installed IRAS measurement system will be shown.

[1] G. S. Parkinson, Catal. Lett. 149, 1137 (2019)

[2] J. Pavelec, et al., J. Chem. Phys. 146, 014701 (2017).