Abstract

This paper analyzes the emission spectra of atmospheric microwave Ar-air plasma and He-air plasma1 at the range of 200 to 1000nm; diagnoses the free oxygenic radicals of them. Results reveal that, free oxygenic radicals occupy large proportion of all elements in the spectra of Ar-air and He-air plasmas. OH free radicals are strong near the 309–314nm band compared with He atomic spectra lines whose comparative intensity very low in He-air plasma. In opposition, NO free radicals and other nitrogen oxides are more than OH radicals in Ar-air plasma. The intensity of free oxygenic radicals in He-air plasma is obvious weaker than in Ar-air plasma, and it changes comply with input energy and gas flow rate.

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