# Hamiltonian operator

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## Hamiltonian operator tutorial[edit]

The Hamiltonian contains one- and two-electron terms. The two-electron terms (summed over i and j) are just the repulsion potential energies between all pairs of electrons. Thus:

is the repulsion between a pair of electrons (distance apart).

The one-electron terms (summed over i) are more varied. For each electron, there is a kinetic energy term and a sum of attractive potential energy terms for each nucleus, A, in the molecule.

is the kinetic energy term with:

is the coulombic attraction between electron i and nucleus A.

is the nuclear charge (atomic number) of atom A and is the distance between electron i and nucleus A.

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