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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 15375-15377 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 56 (1980), S. 307-313 
    ISSN: 1432-2234
    Keywords: Fermi contact interaction ; Bilinear form ; Boundary (asymptotic) conditions ; Hydrogen atom
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract It is shown by rigorous mathematical methods that the so-called Fermi contact interaction does not define any selfadjoint Hamiltonian, and the only possible form of contact interaction localized strictly at r = 0 is found. However, the Fermi contact interaction retains sense when used as a bilinear form in the perturbation theory for Dirac electrons. Some results obtained earlier by other authors are confirmed and interpreted by our analysis.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 43 (1993), S. 993-995 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Pd and Pt monolayers on the (011) surface of bcc metals (Nb,Ta,Mo,W) resemble in many respects the faces of noble metals. We show that this behaviour can be reproduced in a simple tight-binding s-d electron model without invoking any additional mechanism.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 47 (1997), S. 451-454 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract To understand the role oxygen adsorption has in surface magnetism we perform a semi-empirical tight-binding study for the O(1 × 1)/Fe(001) system and compare it with first-principles results. For models with only d electrons on metal atoms an agreement is achieved only for “ionic” models. Actually, the results for transition-metal oxides show that a charge as large as about 1 e on O can be reinterpreted as being of metal s,p-electron origin. Adsorbate-induced core-level shifts in the initial-state approximation are also evaluated.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 17 (1980), S. 1167-1177 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: La théorie qualitative des états de surface de Shockley est utilisée pour discuter l'existence d'états de surface sur trois faces du carbure de niobium: (001), (011), et (111). Les résultats obtenus pour NbC sont généralisés pour inclure d'autres composés de métaux de transition MX, X = C, N, O. Les états de surface dans les matériaux de ce type-là sont importants pour la chemisorption et la catalyse. La théorie qualitative des états de Shockley paraǐt ětre utile pour voir des effects de covalence forte dans les solides.
    Abstract: Die qualitative Theorie der Schockley'schen Oberflächenzustände wird angewandt um die Existenz von Oberflächenzuständen auf drei Flächen von NbC: (001), (011) und (111) zu diskutieren. Die für NbC erhaltenen Resultate werden zu anderen einfachen Übergangsmetallverbindungen, MX, X = C, N, O. verallgemeinert. Oberflächenzustände in solchen Verbindungen sind für Chemisorption und Katalyse wichtig. Die qualitative Theorie der Shockleyzustände scheint für die Analyse von starken kovalenten Effekten in Festkörpern nützlich zu sein.
    Notes: The qualitative theory of Shockley surface states is used to discuss the existence of surface states on three faces of niobium carbide: (001), (011), and (111). The results obtained for NbC are generalized to include other simple transition metal compounds MX, X = C, N, O. Surface states of these and related materials are of interest in chemisorption and catalysis. The qualitative theory of Shockley states appears to be useful tool in detecting strong covalency effects in solids.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 38 (1990), S. 329-338 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The generalization of the well-known Hückel rule of quantum chemistry is combined with the crossing theorem of the method of moments to interpret the calculated properties of two adatoms on the (001) surfaces of the simple cubic metal and the B.C.C. transition metal. The relation between the fourth-order energy moment and the repulsive interaction between adatoms is emphasized. Some conclusions are drawn on the mechanism of the W (001) surface reconstruction.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 32 (1987), S. 501-509 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Based on the use of the important qualitative concept of energy-weighted averages, a few simple rules are formulated that facilitate the analysis of the existence of surface states and enable the estimation of the effect of surface charge self-consistency on the electronic structure of AB-type crystal surfaces. Recent theoretical and experimental investigations of the (001) and (111) surfaces of refractory transition metal compounds TiC and TiN are discussed in detail. The problem of the stability of the polar (111) surface of TiC is mentioned.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 36 (1989), S. 157-167 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The simple semiquantitative approach to the calculation of the energy of surface states, proposed recently by the authors, is applied to high-symmetry surfaces of selected transition metal carbides, nitrides, and oxides. The results are compared with recent experimental and theoretical data. The necessity to include the changes in the potential at the crystal surface is indicated.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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