Abstract
Molecular emission spectra of the OH rotational bands were measured to determine a two dimensional temperature profile of a microwave heated air plasma torch. The method is based on the simulation of rotational line intensities and the comparison with experimental results. A very high accuracy in simulation was obtained by the implementation of the Λ-doubling. The torch itself can be divided into a small (few millimetres in diameter) plasma and a flame which can reach up to 30 mm in diameter and 250 mm in height. While the plasma centre emits a variety of spectral lines, the whole flame is only accessible with the A2 Σ+, v′ = 0 → X2 Π, v″ = 0 transition in the free radical OH at 306.36 nm.
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