Abstract
Time variation of the emission of both positive ions and neutral particles was simultaneously examined with one-and two-component systems of alkali-metal iodides on a platinum wire heated to 1080°C. A “suppression effect” was observed: - by the presence of the heavier alkali-metal iodide, MHI, (1)the emission pattern of the lighter alkali-metal ion, ML+, was much changed, (2)the integrated emission current of ML+ was reduced to 40-60%, and(3)the reduction of ML+ emission current was accompanied by an increase in ML emission in the form of neutral particles by 20-30%, while the MH+ emission was not affected by the presence of WLI. Discussion on a mechanism of this effect is given from three view-points of the work function change, charge transfer, and recombination reaction. The conclusion is that the suppression effect is due to the recombination of ML+ and I- on the filament surface enhanced by the presence of MHI.
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