Upper and lower bounds for ground-state energies in the helium isoelectronic sequence

M. A. Abdel-Raouf

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The formula of Rayleigh [1] and Ritz [2] is used for determining upper bounds for E0's, E1's and E2's of nine members of the helium isoelectronic sequence. A rough estimation for the lower bounds of E0's is carried out using Temple's relation [3]. The calculations show that a 50-dimensional expansion space can be adjusted to obtain results in good agreement with those of other authors and to confine the exact E0's in gaps of the order of 10-5.

Original languageEnglish
Pages (from-to)103-106
Number of pages4
JournalPhysica B+C
Volume97
Issue number1
DOIs
Publication statusPublished - Jul 1979
Externally publishedYes

ASJC Scopus subject areas

  • General Engineering

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