Ab Initio Study of the CO-N₂ Complex: A New Highly Accurate Intermolecular Potential Energy Surface and Rovibrational Spectrum
A new, highly accurate ab initio ground-state intermolecular potential-energy surface (IPES) for the CO-N2 complex is presented. Thousands of interaction energies calculated with the CCSD(T) method and Dunning's aug-cc-pVQZ basis set extended with midbond functions were fitted to an analytical function. The global minimum of the potential is characterized by an almost T-shaped structure and has an energy of -118.2 cm-1. The symmetry-adapted Lanczos algorithm was used to compute rovibrational energies (up to J = 20) on the new IPES. The RMSE with respect to experiment was found to be on the order of 0.038 cm-1 which confirms the very high accuracy of the potential. This level of agreement is among the best reported in the literature for weakly bound systems and considerably improves on those of previously published potentials.
H. Cybulski et al., "Ab Initio Study of the CO-N₂ Complex: A New Highly Accurate Intermolecular Potential Energy Surface and Rovibrational Spectrum," Physical Chemistry Chemical Physics, vol. 20, no. 18, pp. 12624-12634, Royal Society of Chemistry, Apr 2018.
The definitive version is available at https://doi.org/10.1039/c8cp01373j
Keywords and Phrases
Potential Energy Surfaces; Excitation; Rotational Levels
International Standard Serial Number (ISSN)
Article - Journal
© 2018 Royal Society of Chemistry, All rights reserved.