Ab Initio Reconstruction of Interatomic Potential for the Ground Electronic State of CO Molecule
- Authors: Meshkov V.V.1, Pazyuk E.A.1, Stolyarov A.V.1, Usov D.P.2, Ryzhkov A.M.2,3, Savelyev I.M.2, Kozhedub Y.S.2, Mosyagin N.S.3, Shabaev V.M.2,3
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Affiliations:
- Faculty of Chemistry, Moscow State University
- Department of Physics, St. Petersburg State University
- B.P. Konstantinov Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute”
- Issue: Vol 97, No 10 (2023)
- Pages: 1441-1446
- Section: СТРОЕНИЕ ВЕЩЕСТВА И КВАНТОВАЯ ХИМИЯ
- Submitted: 26.02.2025
- Published: 01.10.2023
- URL: https://permmedjournal.ru/0044-4537/article/view/668648
- DOI: https://doi.org/10.31857/S0044453723100163
- EDN: https://elibrary.ru/PVMOAL
- ID: 668648
Cite item
Abstract
The energy of the ground state of the carbon monoxide molecule has been calculated by multi-configuration methods of self-consistent field (MC-SCF), configuration interaction (MR-CI+Q), and the averaged coupled pair functional (MR-ACPF) on a detailed grid and in a wide range of internuclear distances 0.1 < R < 17.0 Å. The scalar relativistic correction is systematically taken into account using the effective second-order Douglas–Krol–Hess (DKH) Hamiltonian. Quantum electrodynamic (QED) correction to mass invariant potential has been estimated for the first time using a model one-electron operator, which has been built independently for each atom. The calculations have been carried out using the family of correlation-consistent aug-cc-pwCVnZ-DK (n = 3, 4, 5) bases for both atoms followed by extrapolation to the complete basis set (CBS) in the framework of the empirical three-point scheme. The resulting potential has been found to be very close to its semi-empirical counterpart near the equilibrium position and at the dissociation limit. It is expected that the most significant clarification ab initio potential corresponds to the intermediate region 2.0 < R < 4.5 Å, where reliable experimental data are not yet available.
About the authors
V. V. Meshkov
Faculty of Chemistry, Moscow State University
Email: avstol@phys.chem.msu.ru
Moscow, Russia
E. A. Pazyuk
Faculty of Chemistry, Moscow State University
Email: avstol@phys.chem.msu.ru
Moscow, Russia
A. V. Stolyarov
Faculty of Chemistry, Moscow State University
Email: avstol@phys.chem.msu.ru
Moscow, Russia
D. P. Usov
Department of Physics, St. Petersburg State University
Email: avstol@phys.chem.msu.ru
St. Petersburg, Russia
A. M. Ryzhkov
Department of Physics, St. Petersburg State University; B.P. Konstantinov Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute”
Email: avstol@phys.chem.msu.ru
St. Petersburg, Russia; 188300, Gatchina, Leningrad oblast, Russia
I. M. Savelyev
Department of Physics, St. Petersburg State University
Email: avstol@phys.chem.msu.ru
St. Petersburg, Russia
Yu. S. Kozhedub
Department of Physics, St. Petersburg State University
Email: avstol@phys.chem.msu.ru
St. Petersburg, Russia
N. S. Mosyagin
B.P. Konstantinov Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute”
Email: avstol@phys.chem.msu.ru
188300, Gatchina, Leningrad oblast, Russia
V. M. Shabaev
Department of Physics, St. Petersburg State University; B.P. Konstantinov Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute”
Author for correspondence.
Email: avstol@phys.chem.msu.ru
St. Petersburg, Russia; 188300, Gatchina, Leningrad oblast, Russia
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