Spectroscopic Characterization of Two Different Microwave (2.45 GHz) Induced Argon Plasmas at Atmospheric Pressure

Abstract

A surface-wave-sustained discharge created by using a surfatron device in a tube open to the atmosphere can be used to maintain a microwave (2.45 GHz) plasma at atmospheric pressure at powers of less than 300 W. The TIA (Torche a Injection Axiale) is a device also producing a plasma that, moreover, permits us to work at high power (higher than 200 W and up to 1000 W). A study of the departure from the thermodynamic equilibrium existing in the argon plasmas created by both devices has been done by using optical emission spectroscopy techniques in order to characterize them and to evaluate their possible advantages when they are used for applied purposes.

Spatially resolved spectroscopy of an atmospheric pressure microwave plasma jet used for surface treatment

“…The results imply that the processes governing the effluent surfatron plasma jet are similar to those described for the TIA device by [22]. The N 2 + molecular ion produced Unauthenticated Download Date | 5/12/18 11:17 PM by charge transfer collisions with argon ions plays an important role in the discharge kinetics.…”

Excitation of Species in an Expanded Argon Microwave Plasma at Atmospheric Pressure

“…X 3 R -) and CN (B 2 R ? X 2 R) systems in the emission spectra of those plasmas proved [28][29][30] that dissociative recombination type reactions (4) were really occurring in the plasma even though nitrogen atomic lines had not been detected. In the argon HF plasma studied in the present work, NH (A 3 P ?…”

Structure of the plasma jet of a pulsed microwave plasma torch of nozzle type

“…Substituting δ = 0.3 × 10 −3 m and ν = 1 × 10 11 Hz we obtain n e 4×10 21 m −3 , which has the correct order of magnitude for the discharge under consideration (see e.g. [8]). …”