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Perturbation calculations of the helium ground state energy

✍ Scribed by M.E. Riley; A. Dalgarno

Publisher: Elsevier Science
Year: 1971
Tongue: English
Weight: 368 KB
Volume: 9
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(71)80248-8

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✦ Synopsis

A comparison is presented for the ground state of the helium atom of high order Rayleigh-Schri)dinger perturbation theories based upon a hydrogenic. a screened hydrogenic, a Hartree and a modified Hartree local zero-order hamiltonian. The hydrogenic zero-order schemes are superior tc the Hartree zeroorder scheme but inferior to the modified Hartree scheme. which yields a substantial improvement in the .rate of convergence.

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