arc.calculations_atom_pairstate.PairStateInteractions.interactionsUpTo#

PairStateInteractions.interactionsUpTo#: Specifies up to which approximation we include in pair-state interactions. By default value is 1, corresponding to pair-state interactions up to dipole-dipole coupling. Value of 2 is also supported, corresponding to pair-state interactions up to quadrupole-quadrupole coupling.