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Adsorption and reaction of formic acid on NiO(100) films on Mo(100): Temperature programmed desorption and high resolution electron energy loss spectroscopy studies J. Chem. Phys. 97, 9447 (1992); 10.1063/1.463268 CO interaction with ultrathin MgO films on a Mo(100) surface studied by infrared reflection-absorption spectroscopy, temperature programmed desorption, and xray photoelectron spectroscopy Model surface studies of magnesium oxide have been carried out using surface sensitive techniques. Ultrathin MgO films have been synthesized under ultrahigh vacuum (UHY) conditions by thermally evaporating Mg onto MoC 1(0) in the presence of oxygen. Low-energy electron diffraction (LEED) studies indicate that the MgO films grow epitaxially with the (100) face ofMgO oriented parallel to Mo( 1(0). The MgO films, prepared under optimum synthesis conditions, have essentially one-to-one stoichiometry, are nearly free from pointlike surface defects, and have properties essentially identical to those of bulk, single-crystal MgO. Adsorption of water and methanol onto the MgO films has been studied using high-resolution electron energy-loss spectroscopy (HREELS) and temperature programmed desorption (TPD). In order to circumvent the difficulty associated with intense multiple surface optical phonon (Fuchs-Kliewer modes) losses, a new approach to acquisition ofHREELS data has been demonstrated. This new approach enables the direct observation of weak loss features due to excitation of the adsorbates without serious interference from multiple phonon losses. Our HREELS studies show that water and methanol undergo heterolytic dissociation, leading to the formation of hydroxyl and methoxy species, respectively. 3892

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Articles you may be interested inThe magnetic and magnetoresistance properties of ultrathin magnetite films grown on MgO substrate J. Appl. Phys. 99, 08J111 (2006); 10.1063/1.2176313 Modification of diffusion coefficients in MgO(100) through the chemical properties of implanted ions J. Chem. Phys. 115, 446 (2001); 10.1063/1.1376379 CO interaction with ultrathin MgO films on a Mo(100) surface studied by infrared reflection-absorption spectroscopy, temperature programmed desorption, and xray photoelectron spectroscopy J. Vac. Sci. Technol. A 10, 2248 (1992); 10.1116/1.577926 Model surface studies of metal oxides: Adsorption of water and methanol on ultrathin MgO films on Mo(100) Ultrathin MgO films have been synthesized under ultrahigh vacuum conditions by evaporating Mg onto Mo ( 100) in various background pressures of oxygen. Low-energy electron diffraction and surface spectroscopic studies show that the MgO films, prepared under optimum oxidation conditions, grow epitaxially in the 200-600 K substrate temperature range and have an essentially one-to-one stoichiometry. The nature of the near-surface defects of the MgO films grown at low oxygen pressures has been explored using electron energy-loss spectroscopy. Finally, the chemical properties of the stoichiometric MgO films have been investigated using high-resolution electron energy-loss spectroscopy.

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