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Color separation in an argon-helium arc due to radiative properties and demixing

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1 Author(s)
Murphy, A.B. ; Telecommun. & Ind. Phys., CSIRO, Lindfield, NSW, Australia

Free-burning arcs in argon-helium mixtures containing a large proportion of helium show a separation between the pink color characteristic of helium arcs and the violet color typical of argon arcs. Two effects are shown to contribute to this; first, demixing, which concentrates helium in the high-temperature region near the center of the arc, and second the fact that the radiative emission from helium, relative to that from argon, increases with temperature

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Plasma Science, IEEE Transactions on  (Volume:27 ,  Issue: 1 )