Rayleigh-Ritz Variation Method and Connected-Moments Polynomial Approach

摘要

We show that the connected-moments polynomial approach proposed recently is equivalent to the well known Rayleigh-Ritz variation method in the Krylov space. We compare the latter with one of the original connected-moments methods by means of a numerical test on an anharmonic oscillator. (C) 2008 Wiley Periodicals, Inc. Int J Quantum Chem 109: 717-719, 2009