# arc.calculations_atom_pairstate.PairStateInteractions.matR#

PairStateInteractions.matR#

Stores interaction matrices in pair-state basis that scale as $$1/R^3$$, $$1/R^4$$ and $$1/R^5$$ with distance in matR[0], matR[1] and matR[2] respectively. These matrices correspond to dipole-dipole ( $$C_3$$), dipole-quadrupole ( $$C_4$$) and quadrupole-quadrupole ( $$C_5$$) interactions coefficients. Basis states are stored in PairStateInteractions.basisStates. Calculated by PairStateInteractions.defineBasis.