mAtomic Hylleraas-cI calculations with linked correlation terms of the form rcrzl are discussed. Formulas for the integration of the radial part and the arising auxiliary integrals are deduced and convergence proofs are given. 0 1995 John Wiley & Sons, Inc.
High-precision variational calculations using multiple basis sets in Hylleraas coordinates are presented for the 1s 2s 'So state of beryllium. The variational bound of -14.667 350(8) a.u. for the nonrelativistic ground-state energy in the infinite-mass approximation is in good agreement edith values obtained by conventional configuration-interaction calculations.PACS number(s): 31.25.Eb
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