This interface implements MP2 extrapolation to the complete basis set limit and an optional higher-order correction (e.g. CCSDT(T), MP2.5 - see the examples).

A following scheme is used:

  1. Halkier, A.; Helgaker, T.; Jørgensen, P.; Klopper, W.; Koch, H.; Olsen, J.; Wilson, A. K. Basis-Set Convergence in Correlated Calculations on Ne, N2, and H2O. Chem. Phys. Lett. 1998, 286, 243–252.