Calculation of Rydberg Levels in the Nitrogen Molecule

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Abstract
The energy levels of the lowest members of Rydberg series in N2 have been calculated using LCAO—MO—SCF functions. We have found only one 1Σu+ level around 104 000 cm−1 and this is the first member of a Rydberg series which converges to the X 2Σg+ ground state of N2+. This level can be identified with the p′ 1Σu+ state. Our calculations suggest that, if the Worley—Jenkins Rydberg states have 1Σu+ symmetry (which is not yet absolutely definite) then, no Rydberg series of the type (npπu) 1IIu←X1Σg+ have yet been observed. Our calculations confirm the configurations previously suggested for the upper states of Worley's third and Hopfield's Rydberg series. The states D 3Σu+, E 3Σg+, z 1Δg, x 1Σg−, and y 1IIg are shown to be the first members of Rydberg series.

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