High Energy States ofN2+andN2

The rotational structure of the $C-X$ bands of ${\mathrm{N}}_2^{+}$ has been analyzed. A rotational perturbation appears in the $v=0\mathrm{}$ level of the $C$ state. Evidence is presented against postulating a vibrational perturbation in the $v=0\mathrm{}$, $v=1\mathrm{}$ levels of this state. Construction of potential curves using the new rotational data shows that previous assignments of vibrational levels are incorrect. A new vibrational numbering is proposed, which is in conformity with the Franck-Condon principle. The use of the Franck-Condon principle in predicting intensities in collisions of the second kind has been verified. Measurement of the rotational structure of the $c-X$ bands of ${\mathrm{N}}_2$ shows that the $c$ state is the $v=1\mathrm{}$ level of the $b^{\prime }$ state. The vibrational analysis confirms this identification, as does the intensity distribution. Perturbations between states $p^{\prime }$ and $b^{\prime }$ are discussed. Evidence is cited to show that the $c$ state of Worley is identical with the $p^{\prime }$ state of Gaydon.