›› 2011, Vol. 30 ›› Issue (9): 15-15.
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Abstract: The analytical configurationinteraction calculation for the ground state of Helium is performed over two con figuration states:ls2 and ls2s.The results show that a 0.02938 Hartree correction to the ground state energy is obtained by add i ng ls2s configuration state.This calcu lation is suitable for the course of undergraduate quantum mechanics.
Key words: Helium, ground state, configuration-interaction
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