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Ab initio modelling of molecular hydrogen rotation in the outside of carbon nanotubes

Abstract : A first-principle modelling of hydrogen molecular rotation in the outside of carbon nanotubes is presented. Density functional theory (DFT)-based symmetry-adapted perturbation theory (SAPT) is first applied to analyse the influence of the rotation on the dispersion and dispersionless H2-nanotube interaction for both sub- and nanometer-sized tubes. An adsorbate three-dimensional wave-function treatment is then applied to calculate the molecular energy levels of the rotating hydrogen molecule. As a key difference with the H2 located inside the tubes, the SAPT-based analysis indicates a marked influence of a nanotube curvature-induced dipole on the angular-dependent balance of exchange-repulsion, electrostatic, and dispersion contributions for narrow nanotubes. As a result, the landscape of molecular energy levels depends strongly on the diameter of the porous material. In addition, an effective one-dimensional model is proposed to account for the nuclear motion, reproducing full-dimensional approach within less than 1%.
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Contributor : Alexander Mitrushchenkov Connect in order to contact the contributor
Submitted on : Monday, February 3, 2020 - 2:12:52 PM
Last modification on : Friday, January 21, 2022 - 4:40:06 PM

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María Pilar de Lara-Castells, Alexander Mitrushchenkov. Ab initio modelling of molecular hydrogen rotation in the outside of carbon nanotubes. Molecular Physics, Taylor & Francis, 2019, 117 (13), pp.1746-1757. ⟨10.1080/00268976.2018.1555340⟩. ⟨hal-02464725⟩



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