Knowledge Bank

A. D. C. discharge through 2 to 10 Torr of flowing nitrogen gas in an inverted II-shaped tube with a flattened center section has been observed with a Czeerny-Turner spectrometer. Ten bands have been recorded in the near infrared at $2.255\mu ,2.419\mu ,2.520\mu ,2.626\mu ,2.737\mu ,2.854\mu ,2.975\mu ,3.336\mu ,3.663\mu$, and $4.070\mu$. The first seven bands appear to belong to one sequence and the last three to another. If the larger sequence is relegated to $\Delta v=v\prime -v\prime \prime =-2$ and the shorter one to $\Delta v=+2$, consistent vibrational assignments may be made based on the electronic transition $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Delta u\to B3\Pi g$. Furthermore, it has been found that four bands, which have been observed by $McFarlane1$ at $5.4\mu ,6.0\mu ,6.6\mu$, and $7.7\mu$ but not assigned, can be placed readily in the resulting Deslandres table. The present treatment of the data yields values for $Te\omega e$, and $\omega eXe$ of the $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Delta u$ state of $59738cm-1,1539cm-1$ and $16.7cm-1$ respectively.