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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Chemical Physics 29 (1978), S. 219-230 
    ISSN: 0301-0104
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Computer Physics Communications 20 (1980), S. 61-63 
    ISSN: 0010-4655
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract If Schrödinger's equation for an electron moving in the field of two stationary point charges is separated, an eigenvalue differential equation containing two separation constants arises for the unknown function U(μ), where μ is the first of the three prolate spheroidal coordinates. For U(μ), Hylleraas (1931) and Jaffé (1933) introduced two series expansions, the coefficients of which have to be calculated as latent vectors of a tridiagonal matrix depending on the basis chosen. This investigation contains a proof that the matrices resulting from the two expansions have the same latent roots. Provided the ratio RZ/p is not a positive integer, a regular diagonal matrix — depending on this ratio only — is constructed which transforms the two matrices into each other and correlates their properly normed latent roots, i. e. the systems of coefficients of the two expansions.
    Abstract: Résumé La séparation de l'équation de Schrödinger pour un électron au champ de deux charges ponctuelles fixes conduit à une équation propre à deux paramètres pour la fonction U(μ) de la première coordonnée elliptique μ. Hylleraas (1931) et Jaffé (1933) donnaient des expansions en série, dont les coefficients sont à déterminer comme vecteurs propres d'une matrice tridiagonale dépendant de la base choisie. Nous démontrons, que les matrices résultant des deux procédés ont les mêmes valeurs propres. A condition que le quotient Rz/p ne soit pas égal á un nombre naturel, nous construisons une matrice diagonale régulière ne dépendant que de ce quotient. Cette matrice transforme les deux matrices l'une en l'autre et aussi les jeux de coefficients des deux séries.
    Notes: Zusammenfassung Bei der Separation der Schrödinger-Gleichung für ein Elektron im Feld zweier festgehaltener Punktladungen tritt eine zweiparametrige Eigenwert-Differentialgleichung für die von der ersten elliptischen Koordinate μ abhängige Funktion U(μ) auf. Für U(μ) wurden von Hylleraas (1931) und von Jaffé (1933) Reihenentwicklungen angesetzt, deren Koeffizienten jeweils als Eigenvektoren einer von der benutzten Basis abhängigen Jacobischen Matrix zu bestimmen sind. In dieser Arbeit wird bewiesen, daß die aus den beiden Ansätzen resultierenden Matrizen dieselben Eigenwertkurven besitzen. Unter der Annahme, daß das Verhältnis RZ/p ungleich einer natürlichen Zahl ist, wird eine nur von diesem Verhältnis abhängige reguläre Diagonalmatrix konstruiert, welche die zwei Matrizen ineinander transformiert sowie deren geeignet normierte Eigenvektoren, also die Koeffizientensätze der zwei Entwicklungen, ineinander überführt.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 13 (1989), S. 295-299 
    ISSN: 1434-6079
    Keywords: 31.20 ; 31.50 ; 34.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have recomputed exact correlation diagrams for the energy of excited states; the system consists of an electron (or a different negatively charged particle) moving in the field of two fixed point chargesZ a ,Z b . The ratiosq=Z a/Zb taken into consideration here were 1, 2, and 3. In the caseq=3, three avoided crossings of energy curves belonging to states of equal symmetry type are contained in the diagram.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 18 (1991), S. 365-372 
    ISSN: 1434-6079
    Keywords: 31.15+9 ; 31.20 Di ; 31.20 Tz ; 34.20 -b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Large gaussian basis sets are employed in simultaneous configuration interaction calculations for the ground states of isoelectronic diatomic molecules. The resulting potential energy curves for three members respectively of four different isoelectronic molecule sequences show the applicability of the method. Comparisons with available results of standard configuration interaction calculations for selected molecules are given. Using our method we often get lower upper bounds for the electronic energy, save computer time and treat physically totally different molecules simultaneously.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2014-02-26
    Description: Using the perturbational-variational Rayleigh-Ritz matrix formalism, the 1/Z-expansion for the ground state of the isoelectronic $H_2$ sequence in the range of the internuclear distance $0.2\le R \le 9.0$ is calculated. Also lower bounds of the radius of convergence, based on Kato's theory of linear operators, are given. The numerical results of the 1/Z-expansion can be compared with the exact results and do not converge in the whole R-range. This behavior is in qualitative agreement with the lower bounds for the radius of convergence and enlights some still open properties of 1/Z- expansions for this sequence in the literature. {\bf PACS:} 31.15 + q; 31.20 Di; 31.20 Tz.
    Keywords: ddc:000
    Language: English
    Type: reportzib , doc-type:preprint
    Format: application/pdf
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