Knowledge Bank

During the course of the investigations pertaining to the bands of the $\mathrm{<mrow\; data-mjx-texclass="ORD">15</mrow>}N18O$ molecule, an impurity band was observed at $4.6\mu$. In view of the simplicity of its structure, it was possible to analyze the rotational structure observed in this band and identify it as due to the $\nu 3$ fundamental of $\mathrm{<mrow\; data-mjx-texclass="ORD">15</mrow>}N218O$. This observation has established the possibility of isolating this isotopic species of nitrous oxide. From the present data the following molecular constants (expressed in $cm-1$) were derived for the $\mathrm{<mrow\; data-mjx-texclass="ORD">15</mrow>}N218O$ molecule: ""[FIGURE]"" $$\begin{array}{l}\nu_{o}=2147.58_8;,,B''=0.3816_8;\B''-B'=0.00302_\tau;,,D'' \simeq 0.7 \times 10^{-7}.\end{array}$$