Erlangen 2018 – scientific programme

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P: Fachverband Plasmaphysik

P 11: Helmholtz Graduate School - Poster

P 11.4: Poster

Tuesday, March 6, 2018, 16:15–18:15, Redoutensaal

T_rot and T_vib determination in a CO₂ plasma — •Federico Antonio D’Isa¹, E. Carbone¹, A. Hecimovic¹, S. Gaiser², A. Schulz², M. Walker², S. Soldatov³, G. Link³, J. Jelonnek³, N. Britun⁴, and Ursel Fantz¹ — ¹IPP, 85748 Garching, Germany — ²IVGP, 70569 Stuttgart, Germany — ³KIT, 76344 Eggenstein-Leopoldshafen, Germany — ⁴University of Mons, B7000 Mons, Belgium

Energy storage on demand is of critical importance for an energy grid with proper integration of renewable energies. The power to gas concept aims to store energy in excess into gas by conversion of CO₂ into chemical fuels such as syngas or methanol. To achieve a conversion effiency high enough to make the process advantageous, the CO₂ molecule must be preferentially dissociated by means of vibrational excitation which requires less energy than direct electron impact dissociation. The determination of the vibrational and rotational temperatures of the molecule in CO₂ plasma is crucial for understanding the conversion mechanism. In this work several CO₂ plasmas excited by microwaves have been studied by optical emission spectroscopy. The emission of the excited states of the C₂ (d³Π_g state) molecule and of the CN (B²Σ⁺ state) molecules is used to determine the rotational and vibrational temperature at pressures between 0.3 to 1 bar by fitting the measured spectra with a simulation done using on PGOPHER and MassiveOES. From the emission of the CO (B¹Σ⁺ state) the rotational temperature has been determined at a pressure of 2 mbar. The results with the fitting routine will be presented and discussed.