Coupled Cluster: Perturbation Theory

This lecture covers the Møller-Plesset perturbation theory, starting with the unperturbed system defined by the Hartree-Fock Hamiltonian. The perturbation is calculated as the difference between the total electron-electron repulsion and the Hartree-Fock electron repulsion. The lecture also discusses the basis functions in Møller-Plesset theory and the energy corrections. The expansion of the perturbed wavefunction in doubly excited Slater determinants is explained, along with the second-order correction to the energy. Quiz questions and solutions are provided to reinforce the understanding of the material.