Abstract
We show that the effect of enhancement of the intensity (Ii) of ion lines, observed in atomic emission analysis when using an arc dual-jet plasmatron, is not an anomalous phenomenon compared with an arc plasma. For total ion energy <15 eV, it corresponds to a thermal mechanism for excitation of the spectra. At higher energy, we observe an increase in the intensity Ii relative to the equilibrium values that is due to the phenomenon of nonresonant charge exchange.
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