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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 10 (1968), S. 181-186 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine Methode zur Berechnung aller Matrixelemente der Operatoren des elektrischen Feldes und des Feldgradienten in einer Slater-Funktionen-Basis bei beliebiger Anordnung der Zentren und Kerne wird angegeben. Durch entsprechende Wahl der Integrationsgebiete und Umformungen ist es möglich, Singularitäten und Spitzen bei der numerischen Integration zu umgehen. Bei vernünftiger Gitterwahl erreicht unser Programm eine Genauigkeit von 10−5 bis 10−6 aE.
    Abstract: Résumé Méthode pour évaluer tous les éléments de matrice des opérateurs champ et gradient du champ électrique dans une base d'orbitales de Slater pour des systèmes à nombre de noyaux et géométrie quelconques. Ces intégrales sont calculées par quadrature numérique en modifiant la fonction á intégrer pour éliminer toutes les singularités. Le domaine d'intégration est fractionné pour éviter d'avoir á intégrer aux points de rebroussement. Avec des réseaux raisonnables ce procédé est convenable pour l'évaluation numérique avec une précision de 5 á 6 décimales (en u. a.). Des cas particuliers sont l'objet d'une brève discussion.
    Notes: Abstract A method is proposed for evaluating all matrix elements of the electric field and electric field gradient operators in a Slater basis set fo systems with an arbitrary number of nuclei and geometry. These integrals are evaluated using a numerical quadrature after having modified the integrand to remove all infinities. The integration ranges are broken to avoid integrating through cusps in the integrand. With reasonable grids these procedures are adequate for numerical evaluation with an accuracy of five to six decimal places (in a.u.). Particular cases are briefly discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 10 (1968), S. 454-457 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The results of an investigation on best double orbital exponents for Hydrogen in H2O, NH3, CH4 are reported. An error analysis for calculations with extended basis sets is presented. This analysis is based on the hypothesis that the errors on the integrals are small so that it is possible to use statistical methods.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 53 (1979), S. 165-173 
    ISSN: 1432-2234
    Keywords: Two-center Slater-type orbital product, Fourier transform of ∼
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Fourier transform of two-center charge distributions corresponding to arbitrary Slater-type orbitals are evaluated by a Gaussian quadrature procedure without any preliminary series expansion of the integrand. Convergence and accuracy of the method are discussed and illustrated.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2234
    Keywords: Electron inelastic scattering from He and Be
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The inelastic collision of fast electrons with ground state closed shell atoms is investigated within the context of First Born Approximation and Random Phase Approximation. Generalized oscillator strengths and total cross sections for 11 S → n 1 D transitions in He and 11 S → n 1 S in Be are evaluated and discussed.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 60 (1996), S. 475-486 
    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: Generalized oscillator strengths for a number of singlet transitions of the NH3 molecule, evaluated according to the random-phase approximation approach, are presented and discussed so as to provide characterization of some portions of the Bethe surface of the molecule. © 1996 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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