Abstract
The influence of nonuniformity of the atom arrival rate, of the emitter temperature and of the adsorption properties of its surface on characteristics of thresholds and hysteresis of the surface ionization is analyzed. It is shown that, unlike the uniform conditions, in the threshold zone the ion current changes with the emitter temperature monotonically and not in a form of a jump ; the width of hysteresis is substantially diminished ; the slope of the first threshold curve is not obligatory equal to the heat of ion adsorption; for a polycrystalline surface the critical temperature for hysteresis to vanish is related to the minimum work function and not to the effective work function.
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