Speaker
Dr
Pavel Dvořák
(Masaryk University)
Description
Concentration of atomic hydrogen radicals in atmospheric-pressure dielectric barrier discharge (DBD) was measured by means of two-photon absorption laser-induced fluorescence (TALIF) and calculated by means of combination of gas flow model with zero-dimensional chemistry model. The volume DBD was ignited in a so-called atomizer (device used in analytical chemistry for detection of hydride-forming elements by absorption spectrometry) in a mixture of argon, hydrogen and oxygen. Both the TALIF measurements and simulation revealed that two sharply separated regions arose in the discharge: A region with a low concentration of atomic hydrogen was formed at the inlet of gases where atomic hydrogen was consumed namely by a reaction with molecular oxygen. The second region with a high concentration of atomic hydrogen was formed farther from the inlet of gases, where most of oxygen was converted to water vapour.
Acknowledgement: This research has been supported by the Czech Science Foundation under contracts GA13-24635S, 17-04329S and P206/14-23532S, by the projects CZ.1.05/2.1.00/03.0086 funded by European Regional Development Fund and LO1411 (NPU I) funded by Ministry of Education, Youth and Sports of Czech Republic, by Institute of Analytical Chemistry of the CAS, v. v. i., Institutional Research Plan no. RVO: 68081715 and by the Masaryk University (F. of Science) project 1102/030.
Primary author
Dr
Pavel Dvořák
(Masaryk University)
Co-authors
Mr
Adam Obrusník
(Masaryk University)
Dr
Jan Kratzer
(CAS)
Prof.
Jiří Dědina
(CAS)
Mr
Marek Talába
(Masaryk University)
