Comments are given upon the approximate self-consistent renormalized RPA(SCrRPA) presented in our previous papar which assumes the correlated ground state wavefunction to be the linear combination of the Hartree-Fock ground state and doubly excited states, in the CI language. The rationalization of the approximate SCrRPA is made from the results computed by the complete SCrRPA, whose recipe is simply made. Finally, a numerical comparison of the several RPA methods is made as to the electronic spectra of four DNA bases by using the CNDO/S method.
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Ito et al. (1976) studied this question.
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