Abstract
We have measured local profiles of the electron density and temperature in an atmospheric plasma using absolute intensities of highly excited argon states. The electron-density profile has been determined independently by spatially resolved measurements of the Stark broadening of the hydrogen-β line. By comparing these two methods, deviations from local thermal equilibrium may be characterized. Experimental results from an inductively-coupled argon plasma are presented and indicate that the plasma is close to LTE.
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