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O: Fachverband Oberflächenphysik

O 9: Poster Session I: New methods I

O 9.4: Poster

Monday, March 1, 2021, 10:30–12:30, P

Design of an IRAS Setup to Investigate Adsorbates on Metal-Oxide Single Crystals — •David Rath, Jiri Pavelec, Gareth Parkinson, Michael Schmid, and Ulrike Diebold — Institut für Angewandte Physik, Technische Universität Wien, A-1040 Wien, Austria

The IRAS system GRISU (GRazing incident Infrared absorption Spectroscopy Unit) was developed for investigations in the research field of single atom catalysis [1]. It combines the commercially available FTIR spectrometer Bruker Vertex 80v with an UHV chamber [2]. GRISU features five mirrors for beam guidance placed in HV and UHV environment. The development was concentrated to optimise the system’s performance, flexibility and usability resulting in a small controllable focal-spot diameter (3 mm) on the sample, different optical apertures, and motorised optical components. The simulated system (done with a ray tracing program and a simplified spectrometer model) shows an efficiency of 13 %, i.e. 13 % of the radiation passing through the first aperture (Ø 6 mm) after the IR source in the FTIR spectrometer reaches the detector after being reflected from the molecular beam spot on the sample. Compared to a commercially available system with two parabolic mirrors with a focal length of 500 mm, this is higher by a factor of about 60. All the optical components are mounted precisely in respect to each other to ensure the high performance requirement also after long term use.

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

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