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P: Fachverband Plasmaphysik
P 10: Poster Session I
P 10.2: Poster
Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Hybrid FTIR setup for gas sampling and in-situ analysis for low-temperature, high-pressure plasmas — •Francesco Franco1, 2, Arne Meindl1, Ante Hecimovic1, Rodrigo Antunes1, and Ursel Fantz1, 2 — 1Max Planck Institute for plasma physics, Boltzmannstr. 2, D-85748 Garching b. München — 2University of Augsburg, Universitätsstr. 1, D-86159 Augsburg
Fourier Transform InfraRed (FTIR) spectroscopy is a flexible, fast and sensitive diagnostic based on the absorption of broadband infrared light from molecules with net electric dipole. This technique can be applied to the qualitative and quantitative analysis of cold gas products and in-plasma reactive species, here in the context of low-temperature, high-pressure plasma reactors for gas conversion (e.g. NH3, CO2 and CH4 into NxHy, CO and CxHy). Important plasma parameters, such as chemical composition and vibrational state distributions, can be derived with FTIR. In this contribution, the development and calibration steps of a new FTIR apparatus are presented, featuring a commercial interferometer and an external and movable detector for both in-situ and gas sampling experimental operation. This configuration deviates from the standard application of these instruments and requires custom hardware implementations. Since FTIR is very sensitive to moisture and environmental contaminants, solutions for atmosphere control along the beamline, between the interferometer and the detector, are outlined, together with technical features of the setup. To carry out quantitative analysis from infrared absorption spectra, the challenges and approaches to calibration of the instrument are discussed.
Keywords: FTIR; Gas conversion; Spectroscopy; Plasma