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Calculations of atomic energy levels have been helpful in expediting the analysis of experimental data.23 However , excep t in the simples t cases, the numerical work is excessive for hand computation, and the calculations have had very limited applicability. It is possible to overcome this limitation by utilizing digital computers. A calculation of the levels of the low even configurations in the spectrum of singly-ionized tantalum (T a n ) is given . This is a typical example of a calculation that is too difficult for hand computation, although fairly simple as compared with others in the field of complex pectra.

Computation of atomic energy levels: Spectrum of singly-ionized tantalum (Ta II)