Abstract
Rayleigh scattering of argon-ion laser radiation has been used to obtain number densities in the outer regions (T<9000 K) of a free-burning arc. Excellent agreement is found between the measured argon atom densities and those predicted by theoretical models (e.g. Kovitya and Cram, 1986). A considerable discrepancy exists between the number densities derived from these scattering measurements and those obtained from argon line emission measurements. This difference is shown to be consistent with the non-equilibrium theory of Cram and co-workers for the outer regions of these arcs.
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