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Diffusion and Reptation Quantum Monte Carlo Study of the NaK Molecule

preprint
revised on 24.08.2018 and posted on 24.08.2018 by Marc E. Segovia, Oscar Ventura

Diffusion Monte Carlo (DMC) and Reptation Monte Carlo (RMC) methods, have been applied to study some properties of the NaK molecule. Hartree-Fock (HF), Density Functional (DFT) and single and double configuration interaction (SDCI) wavefunctions with a valence quadruple zeta atomic natural orbital (VQZ/ANO) basis set were used as trial wavefunctions. Values for the potential energy curve, dissociation energy and dipole moment were calculated for all methods and compared with experimental results and previous theoretical derivations. Quantum Monte Carlo (QMC) calculations were shown to be useful methods to recover correlation in NaK, essential to obtain a reasonable description of the molecule. The equilibrium distance—interpolated from the potential energy curves—yield a value of 3.5 Å, in agreement with the experimental value. The dissociation energy, however, is not as good. In this case, a conventional CCSD(T) calculation with an extended aug-pc-4 basis set gives a much better agreement to experiment. On the contrary, the CCSD(T), other MO and DFT methods are not able to reproduce correctly the large dipole moment of this molecule. Even DMC methods with a simple HF trial wavefunction are able to give a better agreement to experiment. RMC methods are even better, and the value obtained with a B3LYP trial wavefunction is very close to the experimental one.

Funding

ANII

History

Email Address of Submitting Author

oscar.n.ventura@gmail.com

Institution

CCBG-Detema, Facultad de Quimica, Universidad de la Republica

Country

Uruguay

ORCID For Submitting Author

0000-0001-5474-0061

Declaration of Conflict of Interest

No conflict of interest

Version Notes

Version 2 - corrected to avoid faulty display

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