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- W2039394489 abstract "The first-order relativistic corrections to energies can be determined either from the direct perturbation expansion of the Dirac equation or by using the so-called Pauli operator. The two formulae are equivalent for exact non-relativistic reference functions but lead to different results for approximate solutions. The analysis of a model problem with controlled deviation from the exact non-relativistic solution clearly shows a preference for the first-order relativistic energy formula derived from direct perturbation theory. The use of the Pauli approximation with inaccurate non-relativistic reference functions may introduce significant inaccuracies in the calculated relativistic corrections for low-lying s-states." @default.
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- W2039394489 date "1997-08-01" @default.
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- W2039394489 title "Perturbation theory of relativistic effects: relative inaccuracies of approximate results" @default.
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- W2039394489 doi "https://doi.org/10.1016/s0009-2614(97)00699-4" @default.
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