Adsorption kinetics of potassium on SrTiO3(100)

In this paper, we study the kinetics of potassium adsorption on SrTiO3(100) surface at room temperature. The study took place in UHV using AES, EELS, LEED, TPD, and WF measurements. Potassium grows in two-dimensional islands with maximum coverage of 3.9 X 10(14) at/cm(2). During adsorption charge transfer from the K-4s to Ti-3d energy level has been observed. No K-O compound has been measured. After heating at 1050 K most of the adsorbed potassium desorbs and the SrTiO3(100) (1 x 1) LEED pattern reappears. There is not any indication of potassium intercalation into the substrate, either at room or at elevated temperature.