Knowledge Bank

“In the nitrogen afterglow, at liquid nitrogen temperature, we found a new system of bands in the near infra-red region. Preliminary analysis shows that these are probably due to the transition $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Delta g\to B3\Pi g$ of $N2$. The upper state $3\Delta g$ was theoretically predicted by Mulliken at about 7.5 ev above the ground state. In an a.c. condensed discharge of a mixture of $N2+Ne$, we found another system of bands around 2000A. Analysis shows that these are most probably due to the transition $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi g\to A2\Pi u$ of $N2+$. The lower state is the upper state of the Meinel bands ($A2\Pi u\to X2\Sigma g+$”