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- W2091223669 abstract "A new method for accelerating the convergence of Z-1 energy expansions based on the quantum mechanical virial and Hellmann-Feynman theorems is proposed. The convergence rate for the ground state of H- is analysed. The high effectiveness of the proposed method is illustrated by the binding energy of the ground state of He (E=-2.903724382 au) when only eight coefficients of the Z-1 expansion are used. The deviation of this energy from the exact non-relativistic value is 6*10-9 au. Estimates for the energy of the excited states of H- E(1s2s)3S=-0.4999990 au and E(2p2)3P=-0.125352 au are given with errors of a few units in the last decimal place." @default.
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- W2091223669 date "1981-04-14" @default.
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- W2091223669 title "Energy approximants and Z-1perturbation theory" @default.
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- W2091223669 doi "https://doi.org/10.1088/0022-3700/14/7/007" @default.
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