Response to “Comment on ‘Frequency-dependent equation-of-motion coupled cluster hyperpolarizabilities: Resolution of the discrepancy between theory and experiment for HF?’ ” [J. Chem. Phys. 109, 3293 (1998)

Abstract

In a recent comment on our paper, Hättig et al. claim that Eq. (1) of our paper on the equation-of-motion coupled-cluster (EOM-CC) method for frequency dependent polarizabilities is (1) “incompatible with, the so-called ‘generic definition’ of EOM-CC properties and converges to the wrong full configuration limit;” (2) causes our calculations to violate time-reversal symmetry; (3) that we unjustifiably ignore renormalization terms; and (4) that our estimates of relaxation effects are suspect due to Eq. (1) being invalid. In the following we prove Eq. (1) and demonstrate that all subsequent criticism of our paper are spurious.