Moller-Plesset Perturbation Theory MPPT

This Foek operator is used to define the unperturbed Hamiltonian of Moller-Plesset perturbation theory (MPPT) ... 

Another way that additional configurations can be added to the the ground-state wave function is by the use of Moller-Plesset perturbation theory (MPPT). As it happens, a Hamiltonian operator constructed from a sum of Fock operators has as its set of solutions the HF single determinantal wave function and all other determinantal wave... 

Moller-Plesset perturbation theory (MPPT) aims to recover the correlation error incurred in Ilartree- Fock theory for the ground state whose zero-order description is ,. The Moller-Plesset zero-order Hamiltonian is the sum of Fock operators, and the zero-order wave functions are determinantal wave functions constructed from HF MOs. Thus the zero-order energies are simply the appropriate sums of MO energies. The perturbation is defined as the difference between the sum of Fock operators and the exact Hamiltonian ... 

In this chapter, we consider a form of perturbation theory which is associated with the names of Rayleigh and hrddinger (RSPT). Since we are interested in obtaining a perturbation expansion for the correlation energy, we choose the Hartree-Fock Hamiltonian as our zeroth-order Hamiltonian. RSPT with this choice of was applied to N-electron systems in the early days of quantum mechanics by C. Moller and M. S. Plesset and hence is sometimes called Moller-Plesset perturbation theory (MPPT). 

MPPT, see Moller-Plesset perturbation theory MTPA, 14... 

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