MP2-IQA: upscaling the analysis of topologically partitioned electron correlation.When electronic correlation energy is partitioned topologically, a detailed picture of its distribution emerges, both within atoms and between any two atoms. 
MP2-IQA
The interacting quantum atoms (IQA) method was applied to MP2/6-31G(d,p) (uncontracted) wave functions of a wide variety of systems: glycine…water (hydration), the ethene dimer (π-π interactions), benzene (aromaticity), cyclobutadiene (antiaromaticity), and NH3BH3 (dative bond). 
MP2/6-31G(d,p)
Larger molecules can now be accessed to include resonance and solvation of FFLUX force field.
FFLUX force field