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Energy balance calculations have been made of a cylindrical high-pressure LTE discharge which contains small quantities of metal halides with a large excess of mercury. It is assumed that the partial pressures of emitting atoms remain at a constant value throughout the arc, and that the emission coefficient for atoms and ions can be calculated using the Corliss and Bozman (1962) transition probabilities. The model has been used to compare the effects of adding different elements (scandium and iron) and mixtures of elements on the temperature profile, and other properties of metal halide lamps. The self-absorbed radiation of the mercury atoms must be included in order to obtain realistic temperature profiles. It is assumed that for all lines emitted by the added elements, the arc is optically thin.
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Eardley et al. (1979) studied this question.
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