D. A. King's Chemical Physics of Solid Surfaces and Heterogeneous PDF

By D. A. King

ISBN-10: 0444419713

ISBN-13: 9780444419712

ISBN-10: 0444507450

ISBN-13: 9780444507457

The booklet is a multi-author survey (in 15 chapters) of the present kingdom of information and up to date advancements in our knowing of oxide surfaces. the writer record comprises many of the stated global specialists during this box. the fabric lined contains primary thought and experimental reviews of the geometrical, vibrational and digital constitution of such surfaces, yet with a unique emphasis at the chemical homes and linked reactivity. the focus is on steel oxides yet insurance extends from 'simple' rocksalt fabrics equivalent to MgO via to advanced transition steel oxides with various valencies.

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The two (now five-fold) Ti ions immediately adjacent to the vacancy are empty, and it does not cost much energy to place one (or more) of the electrons in them. Thus the schematic picture of such a point defect consists of two Ti^^ ions, each having a 3d^ electron configuration, adjacent to the O vacancy [1]. Needless to say, this population of some of the Ti 3d orbitals gives a very different electronic structure than that of the stoichiometric surface (or the bulk crystal). 1 eV at room temperature [9].

Cr is an insulator at room temperature, with the V 3d electrons (each cation has a 3(f configuration) forming a band that lies just below Ep. This is shown as the heavy curve in the UPS spectra in Fig. 8(a). The other curves in Fig. 8(a) show how the spectrum changes when the stoichiomet- 27 Clean surface 100 L CO 103 L CO N(E) AN(E) Binding Energy [eV] Fig. 8. 8 eV). (b) Differences created by subtracting the clean surface spectrum from the CO-exposed spectra. ric, low-defect-density surface is exposed to the amounts of CO indicated at room temperature.

It is important to consider the connection between the two types of studies. One often refers to the "pressure gap" that separates vacuum studies of chemisorption and catalysis from commercial catalytic reactions, which generally run above —often well above — atmospheric pressure. There is simply no way to properly simulate high pressure conditions in a surface analysis system. Reactions can be run in an attached reaction chamber, which is then pumped out and the sample transferred, under vacuum, into an analysis system equipped for electron, ion and photon spectroscopies.

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Chemical Physics of Solid Surfaces and Heterogeneous Catalysis by D. A. King

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