The reduction of the work function of a polycrystalline W surface due to Cs+ bombardment has been investigated in the incident energy range below 500 eV. Upon exposure of the surface to a Cs+ beam, the work function decreases until a steady state is reached with a total Cs+ dose of less than 1×1016 ions/cm2. A minimum steady state work function surface is produced at an incident energy of ≊40 eV and the steady state work function rapidly increases with bombarding energy. Coverages are significantly lower than that produced on Mo for the same bombarding energies. Auger electron spectroscopy is used to confirm surface coverages. The cesium surface concentration is determined by reflection, sputtering, and implantation.
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Tompa et al. (1986) studied this question.
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