Knowledge Bank

Using a 2-meter vacuum spectrograph and an ordinary transformer discharge with a small amount of $N2$ and several mm of argon or xenon, new bands of $N2$ were observed in the region between 1600--2250 A in each case. All bands are shaded to the long wavelength side, and the bands in the $(N2+A)$ mixture have a single branch while the bands in the $(N2+Xe)$ mixture show two heads. A preliminary vibrational analysis of these bands has been performed, and the hands in the $(N2+A)$ mixture are attributed to $a11\Sigma a-X1\Sigma g+(\nu \infty =67735.5cm-1)$, while the bands in the $(N2+Xe)$ mixture are attributed to $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Sigma a(or3u\Delta )-X1\Sigma g(\nu \infty =65850.4cm-1)$. The present results are compared with Wilkinson and Mulliken’s $results1$ in absorption.