Calculate the ionization energy for (a) Li, (b) F, (c) S, (d) Cl, and (e) Ne using the Hartree–Fock method and the 6-311+G** basis set. Carry out the calculation in two different ways: (a) Use Koopmans’ theorem and (b) compare the total energy of the neutral and singly ionized atom. Compare your answers with literature values.
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