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On the structure and physical origin of the interaction in H2⋯Cl− and H2⋯Br− van der Waals anion complexes

The ab initio three-dimensional potential energy surface (PES) for the weak interaction of hydrogen molecule with bromine anion is presented. The surface was obtained by the supermolecular method at the coupled cluster with single and double excitations and noniterative correction to triple excitati...

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Published in:The Journal of chemical physics 2004-09, Vol.121 (12), p.5852-5859
Main Authors: Lukeš, Vladimı́r, Ilčin, Michal, Laurinc, Viliam, Biskupič, Stanislav
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Language:English
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cited_by cdi_FETCH-LOGICAL-c142t-97e37c2546bfba2f14f25da8b4a7ed027f7ad7fd8c196392594710185d8ade273
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description The ab initio three-dimensional potential energy surface (PES) for the weak interaction of hydrogen molecule with bromine anion is presented. The surface was obtained by the supermolecular method at the coupled cluster with single and double excitations and noniterative correction to triple excitations (CCSD(T)) level of theory. Our calculations indicate the van der Waals (vdW) system for the linear orientation at R=3.37 Å with a well depth of De=660.1 cm−1. The presented PES reveals also transition state for the perpendicular orientation at R=4.22 Å with a barrier of 607.1 cm−1. The physical origin of the stability of vdW H2⋯Br− structure with respect to the H2⋯Cl− one was analyzed by the symmetry adapted perturbation theory based on the single determinant Hartree–Fock (HF) wave function. The separation of the interaction energy shows that the dispersion forces play slightly more important role in the stabilization of the vdW system with Br− than with Cl−.
doi_str_mv 10.1063/1.1784413
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title On the structure and physical origin of the interaction in H2⋯Cl− and H2⋯Br− van der Waals anion complexes
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