Wolfgang Müller

Gerhart Hantke

Franz Seuferling

Peter Schubert

Karl Koeber

Alfons Kotowski

Gerhard Kirschstein

Gerhard Czack

Walter Lippert

Hildegard Banse

Anna Bohne-Neuber

Hans Golder

Hans Karl Kugler

Hildegard Wendt

Elisabeth Bienemann-Küspert

Herbert Engst

Inge Flachsbart

Eleonore Kirchberg

Marie-Luise Klaar

Irmberta Leitner

Ellen von Lindeiner-Schön

Gertrud Pietsch-Wilcke

Nikolaus Polutoff

Heinz Rieger

Karl Rumpf

Werner Schaffernicht

System-Nummer

Wismut

Dieter Gras

Vera Haase

Wolf-Dietrich Fleischmann

As was announced two years ago, the description of the physical properties of molybde num has now been completed in the present volume up to page 124. Whereas most properties, e.g., the electrical, magnetic, and optical properties, are dealt with in the usual manner, the results of studies of the atom and ion emission had to be presented in a revised form, comprising not only the most recent data but having in mind also the corresponding data for tungsten, which will be represented in a supplement volume now in preparation. The various modes of electron emission have also been studied in great detail. Many more pages (exactly 226 pages, as contrasted to three pages in the Main Volume) were needed to present the electrochemical data for molybdenum, which were published to an astonishingly great extent by Russian workers. The large volume of literature is due to the extensive industrial application of the metaL, cf. "MoLybdän" Erg.-Bd. A 1, 1977, and to its occurrence in various oxidation states. Thus the equilibrium between an Mo eLectrode and Mo ions or between an inert eLectrode and Mo ions is deaLt with in the chapters "Standard PotentiaLs" and "PotentiaLs", whereas kinetics and reaction mechanisms of the reduction and oxidation of Mo ions on a dropping mercury electrode and other inert eLectrodes can be found in the chapter "Polarography/ Voltammetry."

Physical Properties, Part 2. Electrochemistry

Mo Molybdenum

Frank Stein

Wolfgang Kurtz

The volume describes physical properties of tungsten metal and covers specifically surface properties, electron emission, and field evaporation. Tungsten surfaces are probably the most extensively studied metal surfaces. Recently, experimentalists and theorists have focussed their interest on the atomic structure, lattice dynamics, and electronic properties of the W(100) surface. While the structure of the reconstructed low-temperature surface is well established, there are still unresolved problems concerning the structure at and above room temperature, the nature of the phase transition, and the driving force for the reconstruction. There are numerous and partly conflicting data on the surface energy, the self-diffusion parameters, and the work function of single-crystal and polycrystal tungsten surfaces. Electron emission, which is of fundamental importance for many applications, comprises thermionic, field, photofield, and photoelectric emission as well as emission induced by impinging electrons, atoms, or ions. Pioneering work in areas like thermionic or field emission is comprehensively discussed. Very recent studies of valence-band and core-level spectra moreover provide detailed information on intrinsic surface properties.

Supplement Volume A4 Surface Properties. Electron Emission

W Tungsten

Gerhard Czack

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