| AVS 65th International Symposium & Exhibition | |
| Plasma Science and Technology Division | Tuesday Sessions |
| Session PS+PB+SE-TuA |
| Session: | Atmospheric Pressure Plasmas |
| Presenter: | Hamid Razavi, Old Dominion University |
| Authors: | H. Razavi, Old Dominion University M. Laroussi, Old Dominion University |
| Correspondent: | Click to Email |
A non-thermal transient glow discharge can be generated remotely in a nonconductive low‑pressure chamber by an external guided fast ionization wave (FIW). We used an atmospheric-pressure LTP jet (APLTPJ) as an external source of FIW to transfer the enhanced electric field at the wavefront to a reduced‑pressure Pyrex glass chamber with no electrical connection to the chamber [1]. Here, we study on the interaction of FIW with a dielectric surface which forms the wall of the low-pressure system.
In this study, key characteristics of the transient diffuse plasma are discussed. Plasma parameters were measured by Langmuir probe and APLTPJ electrical measurements were done to elucidate the operational mechanisms of the FIW as an igniter of a reduced pressure glow discharge plasma. It is shown that the transient discharge in the low-pressure chamber generates a bulk plasma with negative potential due to the nonconductive boundary. We also used Optical emission spectroscopy (OES) to show the physical and chemical characteristics of the APLTPJ plasma and the transient glow discharge plasma. It is shown that the glow discharge plasma is capable of producing second and third ionized nitrogen and oxygen atoms (OII, NII, and NIII). Fast images were taken by an intensified CCD to study the launching and propagation phases of both APLTPJ plasma and the transient reduced pressure glow discharge plasma as well as the incidence of the guided FIW on a dielectric surface.
[1] M. Laroussi and H. Razavi, “Indirect Generation of a Large Volume Diffuse Plasma By an Ionization Wave from a Plasma Jet”, IEEE Trans. Plasma Sci., Vol. 43, No. 7, pp. 2226-2229, (2015).