A theoretical model for the axial segregation in cylindrical high-pressure mercury discharge lamps with metal halide additives is evaluated regarding various diffusion effects and the vertical convection of mercury. The model is applied to the case of NaI and TlI additives and shows the strong influence of ambipolar diffusion on the axial segregation especially for Na, the demixing of which is always more pronounced than that of Tl and I. Furthermore, the model shows the strong influence of the lamp radius and the mercury pressure on the segregation behavior. The numerical results are in agreement with particle densities obtained spectroscopically.
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H.‐P. Stormberg (1981) studied this question.
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