Abstract
We present laser-induced fluorescence (LIF) measurements, spatially and temporally resolved, of tungstenimpurities eroded from the cathode of a free-burning argon arc. Saturation,but more drastically quenching processes limit a quantitative evaluation ofthe measurements. Applying a special measuring technique, we were ableto determine relative densities and, via a Boltzmann plot, excitationtemperatures. A 2D display of the metal impurity can be obtained witha planar LIF arrangement. It shows the distribution of that part of metalcomponent being in a distinct mode of ionization and excitation. Asknown, the population distribution of the tungsten impurity isdominated by strong demixing effects.
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