Comment on Relativistic linear combination of Gaussian-type orbitals density-functional method based on a two-component formalism with external field projectors.
A polemic. The leading order of the relativistic correction of P. Knappe and N. Roesch (ibid. 1990, 92, 1153) is in error by a factor of 2 as compared to the nonrelativistic limit of the Douglas-Knoll transformed no-pair Hamiltonian.
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