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The energies of the lowest $^2P_u$, $^4P_g$ and $2D_g$ states of the boronatom are calculated with $\mu$hartree accuracy, in the basis of symmetrized,explicitly correlated Gaussian lobe functions. Finite nuclear mass and scalarrelativistic corrections are taken into account. This study contributes to theproblem of the energy differences between doublet and quartet states of boron,which have not been measured to date. It is found that the$^2P_u\rightarrow^4P_g$ excitation energy, recommended in the Atomic SpectraDatabase, appears underestimated by more than 300~cm$^{-1}$.

Energy difference between the lowest doublet and quartet states states of the boron atom