A variational calculation with a one-parameter effective charge reproduces lithium and beryllium ground state energies to 2.5% and 3.1% of experiment.
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Calculation of ground state energy of Lithium and Beryllium based on variational method
A variational calculation with a one-parameter effective charge reproduces lithium and beryllium ground state energies to 2.5% and 3.1% of experiment.