Abstract
The retarding potential method has been used to measure the work function changes due to Cs adsorption on the graphite (0001) surface. The work function decreases sharply and linearly with increasing Cs coverage up to a coverage θ = 1×10 14 atoms/cm 2 after which there is no significant change. The work function minimum is reached at the onset of the (√3 × √3)R30° LEED pattern with a resultant ΔΦ of -2.44 eV. The characteristic retarding field current-voltage curves also yield information about localized electron states at the Cs/graphite surface.
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