Knowledge Bank

“The vacuum ultraviolet absorption spectrum of pure solid nitrogen and carbon monoxide at $4.2\circ K$ shows progressions of discrete bands, corresponding to the transitions a $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}\Pi g\leftarrow X \mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}\Sigma g+$ of $N2$ and A $^{1}\Pi”