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The electron and gas temperature of non-equilibrium argon plasma torchsustained by a focused 24 GHz microwave beam in the external atmosphere of airwas measured by optical emission spectroscopy. The excitation temperature ofargon atoms was found about 5000 K, while the vibrational and rotationaltemperatures of ambient nitrogen molecules were respectively estimated at 3000K and 2000 K. The effective mixing of the external gas atmosphere into theplasma torch is experimentally demonstrated. The vibrational and rotationaltemperatures of nitrogen molecules slightly increased with the distance fromthe nozzle exit. Experimental results demonstrate that microwave discharge atatmospheric pressure may be relevant for the decomposition of highly stablemolecules, e.g. carbon dioxide, in non-equilibrium conditions.

Optical emission spectroscopy of non-equilibrium microwave plasma torch sustained by focused radiation of gyrotron at 24 GHz