Band structures in N2 Rydberg complexes

Some general features of p‐complex theory are discussed with particular reference to the different ways in which the energy levels in case b correlate with those in case d depending on whether the ¹Σ state of the complex lies above or below the ${}^1\Pi$ state. The appropriate correlations are made for the case of the np complexes of N₂ which give absorption Rydberg series converging to the ground state of ${\mathrm{N}}_2^{+}$ . The relative intensities of lines are calculated for lower complexes by applying line strength formulas recently derived by Kovacs and using the constants derived from rotational analyses. The results are illustrated for the cases of the 5p and 8p complexes. For the higher np complexes of which rotational analyses cannot be made, extrapolated constants are used in the expressions for energy levels and intensities, and band profiles are computed. The theoretical profiles are compared with those observed experimentally and in this way characteristic changes in structure with increasing n can be interpreted.