Abstract
The electron and ion emission characteristics of the adsorption system lithium on iridium are reported in the range of lithium arrival flux from 1013 to 1018 atoms/cm2·sec. The electron emission S curves exhibit a 2.80-eV heavily lithium-covered work function, no minimum in the composite work function, a 5.35-eV bare iridium work function, and a stronger dependence on lithium flux than for cesium. The surface ionization of lithium on iridium exhibits ionization efficiencies from 10%–35% and a critical temperature envelope, the slope of which yields 2.10 eV for the desorption energy of lithium ions from iridium at critical coverage.
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