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This study presents a new Infrared Reflection Absorption Spectroscopy (IRAS) setup for investigating adsorption on "single-atom" catalysts, addressing the challenges of low reflectivity from oxide supports and sub-monolayer coverage of adsorbates. The setup features improvements such as a high numerical aperture, optimized optical path, controlled incidence angle range, and high mechanical stability. Utilizing adjustable aperture plates, the minimum and maximum incidence angles can be varied to optimize the signal for each sample. This new setup successfully demonstrated enhanced signal-to-noise ratio in D2O and CO absorbance measurements on a rutile TiO2(110) surface, agreeing with established literature, with significantly reduced measurement time.