Surface Diffusion of Sulfur on Oxygen-Covered Tungsten Studied by Auger Electron Spectroscopy

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Abstract
By the electron-beam bombardment of a tungsten surface in an ultrahigh vacuum, we can obtain the surface distribution of sulfur, which localizes at the area of bombardment. Utilizing this phenomenon as a method of depositing localized sulfur, a study was performed by Auger electron spectroscopy on the surface diffusion of sulfur on a polycrystalline tungsten ribbon surface covered with roughly half a monolayer of oxygen. As a result, the activation energy for the surface diffusion of sulfur was determined as 1.03±0.04 eV.