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We show that we can predict the first ionization energy of the carbon atom towithin 0.872 cm$^{-1}$ of the experimental value. This is an improvement ofmore than a factor of 6.5 over the preceding best prediction in [Phys. Rev. A81, 022503], and opens the door to achieving sub-cm$^{-1}$ accuracy forab-initio predictions in larger elements of the periodic table.

Computer-predicted ionization energy of carbon within 1 cm$^{-1}$ of the best experiment