MCHF approximation

MCHF approximation

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In this method, the relativistic effects were included as a first-order correction to the MCHF approximation by evaluating Breit-Pauli operators (mass correction and Darwin corrections, spin-orbit, spin-other orbit (spin of one electron and orbit of other electron), orbit-orbit, spin-spin contact terms) using configuration interaction (CI) method formed by Rudzikas (2007).
The full relativistic generalization of the MCHF approximation is the MCDF method.