Effects of Metal Halides and Impurities on Discharge Parameters

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  • 放電パラメータに及ほす金属ハロゲン化物と不純物の影響

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Substantial effects of metal halides and impurities on discharge parameters contributing to starting voltage in metal halide lamps were investigated.<BR>Townsend's first ionization coefficients α in Ar-Hg Penning mixtures containing NaI, HgI2, I2 H2O and H2 were measured at room temperature and the ionization coefficients per volt η were calculated. Glow discharge break-down voltage Vg as a function-of Pd (P is argon pressure, d is inter-electrode distance) for various combinations of gas composition and coated electrode was measured using an experimental discharge tube. Relation between Vg and discharge parameters (η and work function φ of the electrode) was discussed.<BR>As a result, NaI vapor at room temperature and HgI2 vapor less than-5.9×10-6 Torr at-15°C do not change η in Penning mixtures, however, H2 leads to increase in Vg due to decrease in η, while variation of Vg caused by the mixed H2O depends on change in both η and φ.

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