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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 31 (1990), S. 2535-2537 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A perturbative procedure due to Bender et al. (here referred to as the BMPS procedure) [J. Math. Phys. 30, 1447 (1989)] and useful in solving difficult nonlinear problems, has been used here to solve the Thomas–Fermi (T–F) equation. The present work attempts to balance the ease of the ensuing analysis with the use of an analytic, zero-order function that already contains a good deal of the nonlinearity of the T–F equation. The initial slope of the T–F potential is computed with 0.35% error in a second-order application of the theory.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 44 (1993), S. 891-908 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Difference equations for moment integrals which contain powers of the Airy functionAi(z) and its derivativeAi'(z) i.e. $$\int_0^\infty {z^n [Ai(z)]^\alpha dz,} \int_0^\infty {z^n [Ai'(z)]^\alpha dz,} $$ are obtained. These equations are easily solved for the special case of integer α. The moments occur in recent analytical attempts at solving certain nonlinear problems in Physics and Chemistry.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 13 (1969), S. 106-108 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Unter Berücksichtigung des molekularen Virialsatzes und der Tatsache, daß die potentielle Energie für eine Reihe von iso-elektronischen Molekülen eine homogene Funktion der Kernladungen ist, läßt sich ein einfacher Zusammenhang zwischen den Elektronenenergien iso-elektronischer Moleküle wie z. B. H 2 + , He 2 +3 , Li 2 +5 ,... zeigen. Ist die Elektronenenergie für H 2 + z. B. eine bekannte Funktion g(R), dann betragen die Energien der übrigen Mitglieder einer solchen iso-elektronischen Folge Z 2 · g(ZR), wobei Z die Kernladungszahl ist. Die Methode wird sowohl auf heteronukleare als auch auf Mehrelektronenmoleküle ausgedehnt.
    Abstract: Résumé En utilisant le théoréme virial moléculaire et le fait que l'énergie potentielle pour une série isoélectronique des molécules est une fonction homogène de charge nucléaire on montre une relation simple entre les énergies électroniques des molécules H 2 + , He 2 +3 , Li 2 +5 ,... Quand l'énergie électronique pour H 2 + est une fonction connue g(R) les énergies des membres de la série se donnent à Z 2 g(ZR) ou Z est la charge nucléaire. La méthode est étendue aux molécules hétéronucléaires et aux molécules multiélectroniques.
    Notes: Abstract We have used the molecular virial theorem together with the fact that the potential energy for a series of isoelectronic molecules is a homogeneous function of the nuclear charges to show that the electronic energies of isoelectronic molecules, e.g. H 2 + , He 2 +3 , Li 2 +5 ,... are related in a simple way. That is, if the electronic energy for H 2 + is a known function of R, i.e., g(R), then the energies for the other members of the sequence are Z 2 g (ZR) where Z is the nuclear charge. The method is extended to heteronuclear as well as multi-electronic molecules.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 28 (1972), S. 81-84 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird gezeigt, daß bei isoelektronischen Molekülen die Änderung der physikalischen Eigenschaften in Abhängigkeit von Kernladung und internuklearem Abstand aus einer Symmetrieeigenschaft ihrer Hamiltonoperatoren und Operatoren der kontinuierlichen Gruppe L(l) resultieren.
    Notes: Abstract The simple variation of the physical properties of isoelectronic molecules with nuclear charge and internuclear distance is shown to be the result of a symmetry property of their Hamiltonians and operators under the continuous group L(l).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 11 (1977), S. 869-880 
    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: Green's functions and the symbol manipulative computer language LISP have been used to obtain exact, closed form, first-order functions and second-order energies for the first fourteen states of the hydrogen atom in electric and magnetic fields.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 15 (1979), S. 717-729 
    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: Power moments for all of the reduced hydrogenic Green's functions have been computed. These moments have the same form as the corresponding moments of the free-particle Green's functions. Green's functions of the second kind are defined, and uses for these objects in model potential theory and the theory of many-body Green's functions are pointed out. In the case of the ground state of the hydrogenic atom, the Green's function of the second kind has been given.
    Additional Material: 1 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 30 (1986), S. 51-75 
    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: A theory of isoelectronic molecules which describes stable and metastable members of a sequence has been developed. To achieve this synthesis, it has been necessary to require that the total electronic energy surface E(R,Z,Z') for the sequence contain critical points - that is, values of the nuclear charges Z and Z' at which energy minimum, maximum [at Re(min) and Re(max)], and horizontal inflection points occur. For ground state sequences a primary physical source of these extreme points is the screened, coulombic repulsion of like-charged atomic centers in the diatomics. With this realization, we can write analytical forms that have the correct scaling behavior and which properly model the screened, coulombic repulsion for E along certain straight-line trajectories in the (Z,Z') plane. This leads to the observation that Re(max) values diverge logarithmically in λ-like transitions wherever the screened coulombic repulsion becomes small as the nuclear charges vary along those trajectories.At the horizontal inflection points the E surface contains A2 folds, as required by Thom's theorem for analytical surfaces containing one control parameter. Within the isoelectronic sequence molecular subgroups have been noted and explained in terms of the underlying atomic shell structures of the molecules' constituent atoms. Using input data for seven stable molecules together with the analytical surface selected for study, we have estimated the equilibrium bond distances Re(min), dissociation energies De(min), and harmonic force constants E(2)(min) for 18 other neutral and charged species.
    Additional Material: 10 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 3 (1969), S. 489-492 
    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: A method for the evaluation of the Fourier transform of two-center functions is presented.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 44 (1992), S. 17-43 
    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: A formalism that describes the variation of the spectroscopic properties, De, Re, and ke, of homonuclear, diatomic molecules, with the number of molecular electrons has been developed. The theory describes the interrelation of these properties and predicts “critical” behavior in sequences of “isonuclear” and neutral molecules. Detailed calculations are possible with the help of experimental data in lieu of a deeper, dynamical theory of molecular behavior with respect to electron number. The present work points the way toward a first-principle's theory. © 1992 John Wiley & Sons, Inc.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
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