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- W2040367105 abstract "We use a formalism of integral operators to present a unified approach to variational R-matrix methods for many-electron systems described by the Dirac Hamiltonian. Variational principles for eigenvalues and matrix elements of many-electron integral operators ${mathcal{Bifmmode hat{}else ^{}fi{}}}^{(ifmmodepmelsetextpmfi{})}(E)$ and ${mathcal{Rifmmode hat{}else ^{}fi{}}}^{(ifmmodepmelsetextpmfi{})}(E),$ which are the central objects in the approach, are listed. The Rayleigh-Ritz linear trial functions are used in these principles, yielding second-order variational estimates of eigenvalues, matrix elements, and kernels of these operators. A multiconfiguration Dirac-Hartree-Fock approach to the relativistic R-matrix method is proposed." @default.
- W2040367105 created "2016-06-24" @default.
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- W2040367105 date "2001-05-08" @default.
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- W2040367105 title "Variational<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>R</mml:mi></mml:math>-matrix methods for many-electron systems: Unified relativistic theory" @default.
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- W2040367105 doi "https://doi.org/10.1103/physreva.63.062704" @default.
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