Abstract
Metastable Impact Electron Spectroscopy (MIES) in combination with UPS(HeI) was used to study the interaction of molecular (CO 2, CO, N 2O) adsorbates with magnesium and magnesia (MgO) surfaces at room temperature (RT). Spectra obtained for Mg on Si(100) surfaces and for MgO surfaces are discussed. CO does not chemisorb on magnesium at RT. Dosing the Mg surface with N 2O leads to the dissociation of the N 2O molecule in N 2 and O and to the subsequent oxidation of the surface. Mg surfaces exposed to CO 2 show the formation of CO 3 2−. From the comparison of MIES and UPS spectra the following reaction mechanism is suggested: (i) dissociation of CO 2 in front of Mg; (ii) formation of a Mg O bond: and (iii) CO 2 chemisorption at low-coordinated oxygen ion sites of the surface. Spectra for MgO exposed to CO 2 show only weak CO 3 2− features. This can be explained by CO 3 2− formation at defect sites only. Dosing MgO with CO or N 2O leads to no new features in the MgO spectrum.
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