Abstract
The efficiency (β +) of dissociative positive surface ionization (DPSI) of KCI impinging on a polycrystalline tungsten surface heated in a high vacuum was found to be unity only in an intermediate temperature range ( T ⋍ 1250–1750K). Analysis of the data by our original theory of DPSI yields the following results: (1) at temperatures above and below this range, β + is determined only by the degree of ionization of potassium and that of dissociation of KCI respectively; (2) both ionization of potassium and dissociation of KCI are strongly governed by the effective work function (Ø +) for DPSI; and (3) Ø + increases from 5.1 to ≈ 6eV mainly owing to residual gas adsorption when T decreases from ≈ 2000 to 1200 K. Temperature dependence of the effective work function for thermal electron emission has virtually the same pattern as that of Ø +, thus giving additional evidence to support our theory.
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