Abstract
We propose and implement in this paper a highly correlated method for computing dynamic polarizability of closed-shell atoms and molecules and the van der Waals coefficient C 6 of atoms within the framework of coupled cluster based linear response theory (CC-LRT). Excitation energies (EE), oscillator strengths and the dynamic dipole polarizability have been computed for He, Be and CH +. The coefficient C 6 has been calculated for He and Be. Comparison with the existing data and high quality CI results is found to be quite encouraging, indicating the promise of the method.
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