Knowledge Bank

Twenty-two spectral lines of the $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C16O2$ Q-branch at $617cm-1$ have been observed, and fitted by a cubic polynomial in $J(J+1)$ to a standard deviation of $\pm 3\times 10-4$ $cm-1$. Another Q-branch, at $630.7cm-1$, has been observed for 12 lines, and fitted to a linear polynomial in $J(J+1)$ to $\pm 9\times 10-4cm-1$. The resulting molecular constants are given in Table I. [FIGURE] In addition, the positions of several lines from other isotopes and other bands have been measured with great accuracy relative to the adjacent lines of the above Q-branches.