Topic of Research Seminar: Laser Based Plasma Diagnostics Focused on Ionized and Neutral Reactive Species

Abstract: The absolute density of grounded state atomic nitrogen and its spatial dependence in the plume of atmospheric plasma jet was analyzed using the two-photon absorption laser-induced fluorescence (TALIF) method. The plasma jet is driven at radio frequency and ignited with argon gas at atmospheric pressure. The results of the TALIF measurement show that the spatial absolute density profile is altered when pure argon ignited discharges were shifted into the $N_2$ admixture discharge. The lifetime of the excited state is almost constant with the power of discharge and independent of the position of the plasma plume. In the case of $N_2$ admixture, most of the atomic nitrogen is found near the capillary where the plasma starts blowing out into the atmosphere; on the other hand, in pure argon the absolute concentration increases with distance from the capillary.

Subject Field of Topic: Plasma Physics

Name of Speaker: Muhammad Waseem Khan

Professorial Rank of Speaker: PhD Student

University Email of Speaker: [email protected]

Affiliation of Speaker: Department of Physical Electronics, Faculty of Science, Masaryk University, Czech Republic and NUST Alumnus

Date and Venue: December 19, 2022 at 1530 hrs, School of Natural Sciences (SNS) New building CR # 205, NUST Islamabad Campus