Abstract
Publisher Summary This chapter discusses the characterization and reactivity of oxide surfaces. The rapid disappearance of the blue S centers on admission of O 2 and their absence when MgO is irradiated in oxygen, suggested that the S centre is an electron trapped at an anion surface vacancy. On a surface such an electron is surrounded by a nearest neighbor octahedral distribution of five Mg 2+ ions, the sixth Mg being absent as it is out of the surface leading to a cylindrical symmetry giving rise to the observed anisotropy. It was observed that fast neutron irradiation could produce anion vacancies and populate them with electrons while γ-irradiation can only populate anion vacancies with electrons. The adsorption of methanol on MgO occurs so that one molecule is adsorbed for each ion pair on the surface. Successive additions of the alcohol indicate the buildup of various alcohol species, studied by IR.
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