Concentration measurements of atomic nitrogen in an atmospheric-pressure RF plasma jet using a picosecond TALIF
| Authors | |
|---|---|
| Year of publication | 2024 |
| Type | Article in Periodical |
| Magazine / Source | Plasma Sources Science and Technology |
| MU Faculty or unit | |
| Citation | |
| Web | https://iopscience.iop.org/article/10.1088/1361-6595/ad211a |
| Doi | http://dx.doi.org/10.1088/1361-6595/ad211a |
| Keywords | atomic nitrogen; TALIF; picosecond laser; plasma pencil; atmospheric pressure plasma |
| Description | The absolute concentration and spatial distribution of ground-state atomic nitrogen (N) in an atmospheric pressure plasma jet were measured using the two-photon absorption laser-induced fluorescence (TALIF). The jet was ignited by radio frequency (RF) voltage in argon (or argon with nitrogen admixture) flowing through a silica tube. The spatially resolved measurements of atomic nitrogen concentration were realized in the effluent of the jet. In a pure argon plasma, the N concentration was increased with the distance from the silica tube and reached the maximum value (3.5*1014 cm?3) at the distance of 15 mm, and then sharply decreased at the end of the plume. On the contrary, plasma ignited in Ar with nitrogen admixture, the maximum N concentration was located directly at the end of the silica tube, where plasma starts to blow out into the ambient air. The highest N concentrations for 0.5% and 2% of N_2 in the feed gas were 1.3*1015 cm?3 and 4*1015 cm?3, respectively. |
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