Open AccessAbsolute OH density measurements in a CO2–H2O glow discharge by laser-induced fluorescence spectroscopy
Author(s) -
Maik Budde,
Luca Martini,
M Ceppelli,
Sara Quercetti,
R. Engeln
Publication year - 2022
Publication title -
plasma sources science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 108
eISSN - 1361-6595
pISSN - 0963-0252
DOI - 10.1088/1361-6595/ac5ecc
Subject(s) - laser induced fluorescence , spectroscopy , chemistry , glow discharge , analytical chemistry (journal) , atomic physics , fluorescence , fluorescence spectroscopy , absorption (acoustics) , absorption spectroscopy , laser , rotational temperature , photodissociation , materials science , plasma , optics , photochemistry , organic chemistry , composite material , molecule , physics , chromatography , quantum mechanics
Time-resolved absolute OH density measurements in a millisecond-pulsed DC glow discharge from carbon dioxide with water admixture by laser-induced fluorescence (LIF) spectroscopy are presented. For that purpose, a novel technique is suggested to calibrate the OH LIF setup by means of two-photon absorption LIF spectroscopy measurements on a CO-filled gas cell. OH densities in the order of 10 18 m −3 are reported at a pressure of 6.67mbar with a water admixture of 20% and a discharge current of 50mA. Furthermore, the time evolution of the CO 2 conversion is determined from collision energy transfer LIF and validated against literature. The time-dependent rotational temperature of OH is obtained with LIF thermometry.
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