An Approximate Calculation of the Lower Energy Levels of the Carbon Atom

Slater's theory of the complex atom as modified and extended by Zener and Eckart is applied to the 2p^2 and 2p^3 configurations of the carbon atom. The energy levels resulting from these configurations are computed. Some of the computed energy differences agree roughly with the experimental values, others indicate either that the method is not applicable or that the experimental data are not reliable. The 2p^3, ^5Slevel is found to lie nearest to the normal 2p^2, ^3P level. Of the levels for which experimental data are lacking or doubtful, the 2p^3, ^1D is computed to lie 12. 9 volts above the normal, the 2p^3, ^3S, 13. 7 volts and the 2p^3, ^1P, 14. 7 volts above the normal.