Scaling and Pade approximants in electron correlation calculations

Abstract

The use of scaling in second-order electron correlation calculations is examined in the light of recent comments by Byron and Joachain (1979). The relation between the scaling parameter, Pade approximants and higher order terms in the perturbation series is discussed. Truncation effects in calculations of electron correlation energies by perturbation theory are considered and some remarks on the computational tractability of second-order calculations are made.