Calibration of Quenching for laser-induced fluorescence of CO₂ at 2.7 μm
Abstract: Knowledge about the gas-phase close to an active catalyst is essential in order to understand the properties of the catalytic reaction process. By the use of planar laser-induced fluorescence (PLIF), the gas-phase can be visualized with high spatial and temporal resolution without affecting the catalyst. In this work, catalytic CO oxidation over a Pd(100) catalyst is investigated using laser-induced fluorescence of CO₂. However, as the CO oxidation requires a gas mixture of CO, CO₂ and O₂, the problem of fluorescence quenching arises. This is caused by the CO₂ colliding with other molecules, where some energy transfers into kinetic energy. Therefore, a deeper study of the quenching factor is performed, it shows intensity drops of 50 % as a result of quenching. Ultimately the quenching factors are applied to the Pd(100) measurement showing the gas-phase around the catalyst in greater detail.
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