Origin-Independent Dynamic Polarizability Density from Coupled Cluster Response Theory

The calculation of the origin-independent dynamic electric dipole polarizability, previously presented for uncorrelated and density functional theory (DFT) based methods, has been developed and implemented at Coupled Cluster Singles and Doubles (CCSD) level of theory. The 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, that hide fairly large deviations mainly located in the internuclear regions. The same is observed comparing calculated CCSD and B3LYP polarizability densities, with the remarkable feature that positive/negative deviations between CCSD and HF reverse sign, becoming negative/positive when comparing CCSD to B3LYP.