Using visible and x-ray photoelectron spectroscopy, we measured the work function of a Au(111) surface at a well-defined submonolayer coverage of Cs. For a Cs coverage producing a photoemission maximum with a He-Ne laser, the work function is 1.61+/-0.08 eV, consistent with previous assumptions used to analyze vibrationally promoted electron emission. A discussion of possible Cs layer structures is also presented.
LaRue, J. L., White, J. D., Nahler, N. H., Liu, Z., Sun, Y., Pianetta, P. A., Auerbach, D. J., & Wodtke, A. M. (2008). The work function of submonolayer cesium-covered gold: A photoelectron spectroscopy study. Journal of Chemical Physics, 129(2), . https://doi.org/10.1063/1.2953712