Quantum Monte Carlo with density matrix: potential energy curve derived properties

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.

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Fixed-node diffusion Monte Carlo potential energy curve of the fluorine molecule F2 using selected configuration interaction trial wavefunctions

The Journal of Chemical Physics ◽

10.1063/1.4905528 ◽

2015 ◽

Vol 142 (4) ◽

pp. 044115 ◽

Cited By ~ 42

Author(s):

Emmanuel Giner ◽

Anthony Scemama ◽

Michel Caffarel

Keyword(s):

Monte Carlo ◽

Potential Energy ◽

Configuration Interaction ◽

Potential Energy Curve ◽

Energy Curve ◽

Diffusion Monte Carlo ◽

Fixed Node

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Diffusion and Reptation Quantum Monte Carlo Study of the NaK Molecule

10.26434/chemrxiv.6176849.v2 ◽

2018 ◽

Author(s):

Marc E. Segovia ◽

Oscar Ventura

Keyword(s):

Monte Carlo ◽

Dipole Moment ◽

Potential Energy ◽

Dissociation Energy ◽

Quantum Monte Carlo ◽

Density Functional ◽

Basis Set ◽

Energy Curve ◽

Dft Methods ◽

Trial Wavefunction

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.

Download Full-text

Diffusion and Reptation Quantum Monte Carlo Study of the NaK Molecule

10.26434/chemrxiv.6176849 ◽

2018 ◽

Author(s):

Marc E. Segovia ◽

Oscar Ventura

Keyword(s):

Monte Carlo ◽

Dipole Moment ◽

Potential Energy ◽

Dissociation Energy ◽

Quantum Monte Carlo ◽

Density Functional ◽

Basis Set ◽

Energy Curve ◽

Dft Methods ◽

Trial Wavefunction

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.

Download Full-text