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Journal ArticleDOI

Mixed basis functions in molecular quantum mechanics: III. The linear symmetrie H3 molecule

G. B. Bacskay, +1 more
- 01 Jan 1972 - 
- Vol. 26, Iss: 1, pp 23-32
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TLDR
A series of calculations have been carried out for the linear symmetric H3 molecule using configuration interaction wavefunctions constructed from a mixed set of 1s Slater and floating spherical Gaussian functions as mentioned in this paper.
Abstract
A series of calculations have been carried out for the linear symmetric H3 molecule using configuration interaction wavefunctions constructed from a mixed set of 1s Slater and floating spherical Gaussian functions. The results, although they do not surpass the best CI results reported in the literature, are sufficiently good to encourage further work along these lines.ZusammenfassungEs wurde eine Reihe von Rechnungen für das lineare, symmetrische H3-Molekül durchgeführt, bei denen Wellenfunktionen mit Konfigurations-Wechselwirkung verwendet werden, die aus einem gemischten Satz von 1s Slater- und “floating” sphärischen Gauß-Funktionen konstruiert wurden. Obwohl die Resultate die besten CI Ergebnisse, über die in der Literatur berichtet wird, nicht übertreffen, sind sie so gut, daß sie zu weiterer Arbeit nach dieser Methode ermutigen.

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Citations
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Journal ArticleDOI

Quantum chemistry by random walk: Linear H3

TL;DR: In this paper, a random walk method for calculating wave functions and energies of molecular systems is investigated in its application to the H3 system in a symmetric linear configuration (R=1.757 a.u.) matching the expected saddle point for the reaction H+H2→H2+H.
Journal ArticleDOI

Mixed Ramp–Gaussian Basis Sets

TL;DR: By modeling ramp-Gaussian products as sums of ramps, all of the required one- and two-electron integrals can be computed quickly and accurately by performing self-consistent Hartree-Fock calculations.
Journal ArticleDOI

Mixed basis functions in molecular quantum mechanics: IV. The linear, equidistant system of four interacting hydrogen atoms

TL;DR: In this article, a series of calculations have been carried out for the linear system of four equidistant hydrogen atoms for an internuclear separation of 1.7 a.u. The configuration interaction technique was used, the orbital basis consisting of a mixed set of 1s Slater and floating spherical Gaussian functions.
Book ChapterDOI

Self-consistent electron–nucleus cusp correction for molecular orbitals

TL;DR: In this article, a method for imposing the correct electron-nucleus (e-n) cusp in molecular orbitals expanded as a linear combination of (cuspless) Gaussian basis functions is described.
References
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Journal ArticleDOI

Potential Energy Surface for H3

TL;DR: In this article, an analytic semi-empirical expression for the ground-state potential energy surface of the H3 system was developed using the valence-bond formulation with the inclusion of overlap and three center terms.
Journal ArticleDOI

I. Calculation of Energy of H3 Molecule

TL;DR: In this paper, the potential energies for linear symmetrical configurations of the triatomic hydrogen molecule have been calculated by the variational method with hydrogen-like 1s atomic orbitals by varying the effective charge and the amount of all polar and homopolar states in the eigenfunction.
Journal ArticleDOI

Molecular Schrödinger Equation. VI. Results for H3 and Other Simple Systems

TL;DR: In this article, the potential energy surfaces for the H+H2→H2+H reaction were constructed for the linear and isosceles triangular configurations of the H3 system and the path of minimum energy along these surfaces was shown to pass through a maximum 7.74 kcal above the reactants.
Journal ArticleDOI

Energy Threshold for D+H2→DH+H Reaction

TL;DR: The first direct determination of a threshold energy for a reaction involving the formation and breaking of covalent bonds was made in this paper. But the threshold energy was not defined for the case of D+H_2→DH+H.
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