Highly excited states of gerade symmetry in molecular nitrogen

Highly excited states of gerade symmetry in molecular nitrogen have been investigated in a resonance-enhanced XUV+Vis (extreme ultraviolet+visible) transition scheme. Nineteen bands have been observed, of which only four involve known states [k ¹P_g (u = 1), x ¹S^–_g (u = 2), and y ¹P_g (u = 1,2)], albeit in new systems. Three of the newly observed states have been assigned as y ¹P_g (u = 3) and k ¹P_g (u = 2,3). Level energies are determined with an accuracy of =0.20 cm^–1