Fluorescence (TALIF) Measurement of Ground State Atomic Nitrogen Concentration in an Argon RF Plasma Pencil measured using Picosecond Laser
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| Year of publication | 2023 |
| Type | Conference abstract |
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| Description | The average density of ground-state atomic nitrogen (N) and its spatial distribution in a plasma jet plume was analyzed using the picosecond two-photon absorption laser-induced fluorescence (TALIF) method. The plasma jet is a device used as a source of reactive species (H, O, OH, N, NO), having many applications in nitriding metal and surface modification. In our case, the jet is driven at radio frequency (RF) voltage and ignited in argon at atmospheric pressure. The measurements were performed in pure argon and argon with an admixture of nitrogen. In the case of Ar with nitrogen admixture, most atomic nitrogen production is found near the capillary, where the plasma starts blowing out into the atmosphere. On the contrary, in pure argon discharge, the absolute concentration increases with distance from the capillary up to 15 mm and then decreases up to the end of the plume. The average concentration of atomic nitrogen in pure argon discharge is estimated to be 1015 cm -3. The average concentrations with an admixture of nitrogen gas 20 and 80 sccm are estimated to be 1016 cm 3. The results show that the plasma jet has a high ability to generate atomic nitrogen. |
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