Auger electron spectroscopy of cesium adsorbed on clean and oxygen covered (100) tungsten

Auger electron spectroscopy of cesium adsorbed on clean W(100) shows that the well known N_4,5O_2,3O_2,3 peak can be resolved into three peaks at 43–45.8 and 48.4 eV. Simultaneously as well defined peak appears at 62 eV and it is shown that this transition involves ionization of the N₄N₅ cesium level. An additional peak appears at 56.5 eV as cesium adsorbs on a previously oxygen-covered W(100) surface. Its existence is discussed and might indicate that oxygen valence electrons are involved in this new transition.