A coupled cluster calculation of the quadrupole polarizability of CO

The quadrupole moment (θzz) and quadrupole polarizability C tensor are calculated for the ground state of carbon monoxide. The results are based on finite-field energies computed using the coupled-cluster double excitation model (commonly known as CCD), corrected by fourth-order contributions from single and triple excitations computed with CCD amplitudes. The final values are θzz=−1.50 ea20, Cxx,xx =25.98 e2a40E−1h, Czz,zz =47.01 e2a40E−1h and C̄=56.03 e2a40E−1h.