Optical emission spectroscopy, thermodynamical and thermal disequilibrium aspects in an inductively coupled plasma torch. Experimental applications to - mixtures

The purpose of this article is to study experimentally and theoretically the spectral line ratios O 700.22 nm/N 746.87 nm with a sample gas mixture of and (notably for pure air) in an inductively coupled plasma (ICP) torch. We study theoretically the influence of the thermal disequilibrium on the composition and on the volumic enthalpy in a plasma produced in an ICP torch, and we show that the lower temperature in the plasma is set by the power supplied by the inductive coil. If the temperature (or heavy species temperature for plasma out of thermal equilibrium) is sufficiently low (