EXO-ELECTRON EMISSION DURING THE OXIDATION OF ALKYLATED W(110) SURFACES

We have investigated the emission of electrons and photons during the oxygenation of submonolayer (coverage theta(Alk) less-than-or-equal-to 1 monolayer (ML)) alkalated W(110) surfaces originating from a non-adiabatic surface reaction. Exo-electron energy distributions have been measured as a function of the alkali-precoverage. The electronic structure is monitored by MIES (metastable impact electron spectroscopy) and UPS as well as WF (work function) measurements. The surface WF turns out to be a crucial parameter in the investigation. An interpretation involving Auger de-excitation into the O2 molecule affinity level is supported by the results of substituting O2 by CO molecules in the experiments.