The calculation of the origin-independent density of
the dynamic
electric dipole polarizability, previously presented for uncorrelated
and density functional theory (DFT)-based methods, has been developed
and implemented at the coupled cluster singles and doubles (CCSD)
level of theory. A pointwise analysis of polarizability densities
calculated for a number of molecules at Hartree–Fock (HF) and
CCSD clearly shows that the electron correlation effect is much larger
than one would argue considering the integrated dipole electric polarizability
alone. Large error compensations occur during the integration process,
which hide fairly large deviations mainly located in the internuclear
regions. The same is observed when calculated CCSD and B3LYP polarizability
densities are compared, with the remarkable feature that positive/negative
deviations between CCSD and HF reverse sign, becoming negative/positive
when comparing CCSD to B3LYP.