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In our present study we try to establish a phenomenological model based on classical dipole picture to depict the anomalous variation of work-function of a cesiated tungsten surface in terms of cesium coverage. We have shown that angular orientation of the dipoles created between adsorbed Cs atom and W substrate atom may play a role to determine the absolute work function values at higher coverage. A fitting formula is identified based on classical model by incorporating the angular orientation factor. This phenomenological model fits well with the previous experimental results and the density function theory based calculations up to 0.8 monolayer.In our present study we try to establish a phenomenological model based on classical dipole picture to depict the anomalous variation of work-function of a cesiated tungsten surface in terms of cesium coverage. We have shown that angular orientation of the dipoles created between adsorbed Cs atom and W substrate atom may play a role to determine the absolute work function values at higher coverage. A fitting formula is identified based on classical model by incorporating the angular orientation factor. This phenomenological model fits well with the previous experimental results and the density function theory based calculations up to 0.8 monolayer.

Role of angular orientation of dipoles on work function during cesium deposition on a metal surface – A phenomenological model