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  • 1
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 47 (1960), S. 536-537 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    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: Zusammenfassung Mit einem quantenmechanischen Variationsverfahren unter Verwendung einer minimalen Basis an STO-Funktionen werden nach der Einzentrummethode Wellenfunktion, geometrische Struktur, Energie des Molekülgrundzustandes und Bindungsabstände für eine Reihe von Zinnhydriden vom Typ SnH n , SnH n + und SnH n - (n=3,4 oder 5) berechnet. Für das Stannan-Molekül SnH4 wird die Ionisierungsenergie und die Protonenaffinität bestimmt.
    Abstract: Résumé Par la méthode monocentrique, pour quelques hydrures de l'étain du genre SnHn, SnH n + et SnH n - (n=3,4 ou 5) sont calculées la fonction d'onde, la structure moléculaire, l'énergie de l'état fondamental et les longueurs de liaison. Pour la molécule SnH4 sont déterminés le potentiel d'ionisation et l'affinité protonique la première fois.
    Notes: Abstract OCE-Calculations with minimal STO-sets are reported for molecular wavefunctions, molecular symmetries, ground state energies and bond distances of some tin hydrides of the type SnHn, SnH n + and SnH n - (n=3,4 or 5). Further on the first ionization potential and the proton affinity are obtained for SnH4.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 21 (1971), S. 185-190 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The notion of “neighbouring problems” is transfered from Quantum to Classical Mechanics and is used to develop a classical perturbation theory which is similar so far to the theory of Schrödinger.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 3 (1965), S. 439-457 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Five-membered heterocycles with one hetero atom were treated with a one center method. A basis of orthogonal, monoelectronic functions in spherical coordinates was chosen which extend over the whole molecule and are centered in the middle of the five-membered ring. As radial functions were chosen Slater functions, as ϑ-angle functions appropriate Legendre functions and as ϕ-angle functions Hill functions with regard to the hetero atom. The energy of the ground state including electronic interaction explicitly was minimized with respect to the index l of the Legendre functions and the parameter q of the Hill functions. The electronic charge density, dipole moment, transition moments, excitation energies and diamagnetism were calculated in reasonable accord with experiment, but not the ionisation potential.
    Abstract: Résumé Pour traiter les monohétérocycles à cinq atomes, nous avons adopté une base orthogonale de fonctions monoélectroniques s'étendant sur toute la molécule et ayant l'origine à son centre. Ces fonctions, séparables en coordinates sphériques, se composent de fonctions de Slater (partie radiale), fonctions appropriées de Legendre de l'angle ϑ et fonctions de Hill de l'angle ϕ (pour tenir compte de l'hétéroatome). L'énergie de l'état fondamental, avec interaction électronique explicite, est minimisée relativement à l'indice l des fonctions de Legendre et au paramètre q des fonctions de Hill. La densité électronique, le moment dipolaire, les moments et les énergies de transition et le diamagnétisme se calculent en accord satisfaisant avec l'expérience, mais non pas le potentiel d'ionisation.
    Notes: Zusammenfassung Fünferheterozyklen mit einem Heteroatom wurden mit einer Einzentrenmethode behandelt. Als Einteilchenfunktionen wurde eine Basis von orthogonalen Funktionen in Kugelkoordinaten gewählt, die sich über das ganze Molekül erstrecken und am Mittelpunkt des Fünfrings zentriert sind. Als Radialfunktionen wurden Slaterfunktionen, als ϑ-Winkelfunktionen geeignete Legendrefunktionen und als ϕ - Winkelfunktionen zur Berücksichtigung des Heteroatoms Hillfunktionen gewählt. Die Energie des Grundzustandes unter Einschluß der Elektronenwechselwirkung wurde bezüglich des Index l der Legendrefunktionen und des Parameters q der Hillfunktionen minimisiert. Elektronendichte, Dipolmoment, Übergangsmomente, Anregungsenergien und Diamagnetismus ließen sich quantitativ erfassen, die Ionisationsenergie nicht.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 19 (1970), S. 155-166 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Nach der Einzentrummethode werden für eine Reihe von Germaniumwasserstoffverbindungen vom Typ GeH n , GeH n + und GeH n − (n = 3, 4 oder 5) Wellenfunktion, geometrische Struktur, Energie des Molekülgrundzustandes und Bindungsabstände berechnet. Für das German-Molekül GeH4 wird darüber hinaus die Bindungsenergie, die Ionisierungsenergie und die Protonenaffinität erstmals bestimmt.
    Abstract: Resume Par la méthode monocentrique, pour quelques hydrures de germanium du genre GeH n GeH n + et GeH n − (n = 3,4 on 5) sent calculées la fonction d'onde, la structure moléculaire, l'énergie de l'état fondamental et les longueurs de liaison. Pour la molécule GeH4 sent déterminés l'energie de liaison, le potential d'ionisation et l'affinité protonique la première fois.
    Notes: Abstract OCE-Calculations are reported for molecular wavefunctions, molecular symmetries, ground state energies and bond distances of some germanium hydrides of the type GeH n , GeH n + and GeH n − (n = 3, 4 or 5). Further on the binding energy, first ionization potential and proton affinity are obtained for GeH4.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 42 (1976), S. 1-3 
    ISSN: 1432-2234
    Keywords: Non-spherosymmetric system, diamagnetic susceptibility of ∼
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The diamagnetic susceptibility of the ground state of a non-spherosymmetric system is calculated, and the eigenfunction used is the exact solution of the problem and can be written in a compact form.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 51 (1979), S. i 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 44 (1977), S. 351-373 
    ISSN: 1432-2234
    Keywords: Natural orbital analysis ; Diatomic orbitals ; H2, excited states of ∼
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Starting from the demi-H 2 + -model for Rydberg states, ab initio calculations of the energy and the wave function for some excited states of H2 have been carried out with the help of diatomic orbitals. The potential curves and wave functions for the following states: 21Σ g〈 /+ , 31Σ g〈 /+ , 13Σ g〈 /+ , 23Σ g〈 /+ , 11Σ u〈 /+ , 21Σ u〈 /+ , 13Σ u〈 /+ , 23Σ u〈 /+ , 33Σ u〈 /+ , 11Π g , 13Π g , 11Π u , and 13Π u , have been calculated by a complete CI (configuration interaction) calculation in the sense that all configurations of the state symmetry have been used which can be formed from a given basis set. From the wave functions thus obtained the natural spin orbitals are calculated subsequently to the variational calculations. The dependence of the occupation numbers of the natural spin orbitals on internuclear distance is interpreted according to the model and is used for the explanation of the special features like double minima and maxima which occur in the potential curves of H2. For the curves of the occupation numbers a non-crossing rule in analogy to that for potential curves is valid. The potential curves for the states 13Π g and 13Π u have been improved by the use of linear combinations of diatomic orbitals with different nuclear charges, which allow a flexible transition to linear combinations of atomic orbitals.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 45 (1977), S. 137-145 
    ISSN: 1432-2234
    Keywords: Ion cyclotron resonance (ICR) ; Ions in ICR cells, quantum mechanical treatment of ∼
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A quantum-mechanical treatment of the power absorption of ICR ions based on a minimized wavepacket-approach is presented. With the aid of minimum wavepackets constructed using the exact wavefunctions for the ion motions in a homogeneous magnetic field, the power absorption of the ions in cyclotron resonance has been treated within the framework of the linear response theory. The result agrees with that obtained according to the projection-operator formalism.
    Type of Medium: Electronic Resource
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