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Dynamical Electron Correlation Within Hartree-Fock Limitation

preprint
submitted on 30.08.2017, 07:51 and posted on 31.08.2017, 18:54 by Arijit Bag
Aim: Calculation of dynamical electron
correlation energy within Hartree Fock formalism
to achieve post Hartree Fock accuracy.

Achievement: Using intermediate Hamiltonian
technique and perturbation methodology we can
construct a weave equation which on projection
gives very simple equation for correlation
energy. Correlation energy only depends on the
amount of perturbation. This method is applied
for few small molecules. It is found that this
method produces very accurate results which is
comparable to CCSD method.

Conclusion: The present method which is
termed as Extended Hartree Fock (EHF)
method is proved to be a very good tool for
electronic structure theory as its computational
requirement is equivalent to HF method but its
accuracy is comparable to Coupled Cluster
based methods.

Funding

No funding

History

Topic

  • Theory

Email Address of Submitting Author

bagarijit@gmail.com

Institution

Indian Institute of Science Education and Research Kolkata

Country

India

ORCID For Submitting Author

0000-0002-0177-9605

Declaration of Conflict of Interest

There is no conflict of interest.

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