Kinetic energy operator nuclear motion Schrodinger equation

Using this logic, we set the nuclear motion in to zero for a moment and treat the electron in terms of an effective Hamiltonian, H ff, which includes all the terms of Eq. 5.5 except the nuclear kinetic energy operator K uc Then we solve the Schrodinger equation for this effective Hamiltonian at a single value of R to get the electronic wavefunctions and energies at that bond length ... 

The Schrodinger equation for nuclear motion contains a Hamiltonian operator Hop,nuc consisting of the nuclear kinetic energy and a potential energy term which is Eeiec(S) of Equation 2.7. Thus... 

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