Challenging High-Level ab initio Rovibrational Spectroscopy: The Nitrous Oxide Molecule

Author:

Schröder Benjamin1,Sebald Peter1,Stein Christopher,Weser Oskar1,Botschwina Peter1

Affiliation:

1. Institut für Physikalische Chemie, Universität Göttingen, Tammannstraße 6, 37077 Göttingen, Deutschland

Abstract

Abstract The equilibrium structure and rovibrational energies of nitrous oxide (N2O) in its electronic ground state (X 1 Σ +) are derived from a high-level ab initio potential energy function (PEF). This PEF is based on a composite approach with the basic contribution given by explicitly correlated coupled-cluster (CC) calculations. Smaller contributions include corrections due to inner-shell correlation, scalar-relativistic effects and higher-order correlation up to iterative pentuple excitations (CCSDTQP in CC nomenclature). The high importance of higher-order correlation in order to reach the desired accuracy led to the use of an extrapolation scheme to approximately account for the effect of hextuple and some pentuple excitations. A reasoning for the soundness of the method is given in this work. The results of the rovibrational calculations are compared to those of two multi-reference (MR) based composite PEFs, where the basic contribution is given by MR configuration interaction and MR average coupled-pair functional calculations. A highly accurate electric dipole moment function is also computed by the three composite methods in excellent agreement with the experimental values available. Subtle irregularities in the intensity pattern are reproduced in great detail and several kinds of resonances are analyzed without the need to empirically adjust our best ab initio PEF. The equilibrium bond lengths were determined by a mixed experimental/theoretical approach yielding R e(NN) = 1.12695(10) Å and R e(NO) = 1.18539(5) Å.

Publisher

Walter de Gruyter GmbH

Subject

Physical and Theoretical Chemistry

Reference2 articles.

1. Spectrosc Spec - trosc in press;Botschwina;Mol Phys DOI,2014

2. A Sánchez de Merás dal The Dalton quantum chemistry program system , WIREs Comput a molecular electronic structure program release DALTON see http : / / daltonprogram org and and and Alexander Mitrushchenkov , Kazim and Kirk;Saue;Mol Sci and Phys Rev Chem Phys Chem Phys Chem Phys Chem Phys Phys Chem Chem Phys Phys Chem Phys,2014

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