The Cauchy moments are derived and implemented for the approximate triples model CC3 with the proper N7scaling (where N denotes the number of basis functions). The Cauchy moments are calculated for the Ne, Ar, and Kr atoms using the hierarchy of the coupled-cluster models CCS, CC2, CCSD, CC3 and a large correlation-consistent basis sets augmented with diffuse functions. A detailed investigation of the one- and N-electron errors shows that the CC3 results have the accuracy comparable to the experimental results. © 2005 Elsevier Inc. All rights reserved.
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