Calculation of the dynamic dipole polarizabilities and Van der Waals coefficients of beryllium and carbon atoms in the ground state

Abstract

An expansion of the perturbed atomic state wavefunction in terms of R-matrix states is used to calculate the dynamic dipole polarizability alpha ( omega ) of the ground ¹S state of the beryllium atom and the ground ³P state of the carbon atom. The effect of including configuration interaction in both the ground and perturbed state wavefunctions is studied. The corresponding Van der Waals C₆ coefficients of the long-range interaction between two ground state beryllium atoms and between two ground state carbon atoms, are also calculated.