Abstract
The dipole and quadrupole polarizability functions of CO are calculated by using the finite-field form of the complete fourth-order many-body perturbation theory. At the experimental equilibrium distance R CO = 2.132 au the calculated values of α X,X, α Z,Z, C X,X and C Z,Z are equal to 12.02, 15.59, 26.01, and 48.03 au. Both the basis set dependence of the calculated polarizabilities and the convergence of the corresponding correlation perturbation series are investigated in relation to calculations of potential energy surfaces for weak van der Waals complexes of CO.
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