CVRQD ab initio ground-state adiabatic potential energy surfaces for the water molecule

Paolo Barletta, Sergei V. Shirin, Nikolai F. Zobov, Oleg L. Polyansky, Jonathan Tennyson, Edward F. Valeev, Attila G. Császár

Research output: Contribution to journalArticle

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Abstract

The high accuracy ab initio adiabatic potential energy surfaces (PESs) of the ground electronic state of the water molecule, determined originally by Polyansky [Science 299, 539 (2003)] and called CVRQD, are extended and carefully characterized and analyzed. The CVRQD potential energy surfaces are obtained from extrapolation to the complete basis set of nearly full configuration interaction valence-only electronic structure computations, augmented by core, relativistic, quantum electrodynamics, and diagonal Born-Oppenheimer corrections. We also report ab initio calculations of several quantities characterizing the CVRQD PESs, including equilibrium and vibrationally averaged (0 K) structures, harmonic and anharmonic force fields, harmonic vibrational frequencies, vibrational fundamentals, and zero-point energies. They can be considered as the best ab initio estimates of these quantities available today. Results of first-principles computations on the rovibrational energy levels of several isotopologues of the water molecule are also presented, based on the CVRQD PESs and the use of variational nuclear motion calculations employing an exact kinetic energy operator given in orthogonal internal coordinates. The variational nuclear motion calculations also include a simplified treatment of nonadiabatic effects. This sophisticated procedure to compute rovibrational energy levels reproduces all the known rovibrational levels of the water isotopologues considered, H2 O16, H2 O17, H2 O18, and D2 O16, to better than 1 cm-1 on average. Finally, prospects for further improvement of the ground-state adiabatic ab initio PESs of water are discussed.

Original languageEnglish
Article number204307
JournalThe Journal of Chemical Physics
Volume125
Issue number20
DOIs
Publication statusPublished - 2006

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Potential energy surfaces
Ground state
potential energy
Molecules
ground state
Water
water
molecules
Electron energy levels
energy levels
harmonics
zero point energy
Electrodynamics
Electronic states
Vibrational spectra
quantum electrodynamics
Extrapolation
Kinetic energy
field theory (physics)
configuration interaction

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Barletta, P., Shirin, S. V., Zobov, N. F., Polyansky, O. L., Tennyson, J., Valeev, E. F., & Császár, A. G. (2006). CVRQD ab initio ground-state adiabatic potential energy surfaces for the water molecule. The Journal of Chemical Physics, 125(20), [204307]. https://doi.org/10.1063/1.2378766

CVRQD ab initio ground-state adiabatic potential energy surfaces for the water molecule. / Barletta, Paolo; Shirin, Sergei V.; Zobov, Nikolai F.; Polyansky, Oleg L.; Tennyson, Jonathan; Valeev, Edward F.; Császár, Attila G.

In: The Journal of Chemical Physics, Vol. 125, No. 20, 204307, 2006.

Research output: Contribution to journalArticle

Barletta, P, Shirin, SV, Zobov, NF, Polyansky, OL, Tennyson, J, Valeev, EF & Császár, AG 2006, 'CVRQD ab initio ground-state adiabatic potential energy surfaces for the water molecule', The Journal of Chemical Physics, vol. 125, no. 20, 204307. https://doi.org/10.1063/1.2378766
Barletta P, Shirin SV, Zobov NF, Polyansky OL, Tennyson J, Valeev EF et al. CVRQD ab initio ground-state adiabatic potential energy surfaces for the water molecule. The Journal of Chemical Physics. 2006;125(20). 204307. https://doi.org/10.1063/1.2378766
Barletta, Paolo ; Shirin, Sergei V. ; Zobov, Nikolai F. ; Polyansky, Oleg L. ; Tennyson, Jonathan ; Valeev, Edward F. ; Császár, Attila G. / CVRQD ab initio ground-state adiabatic potential energy surfaces for the water molecule. In: The Journal of Chemical Physics. 2006 ; Vol. 125, No. 20.
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