Knowledge Bank

Using a tunable diode laser spectrometer, the infrared absorption spectra of four isotopic species of carbon monosulfide have been observed in the positive column of a DC discharge of $CS2$ and Ar. The wavelengths of 115 vibration-rotation transitions between 1180.5 and $1266.1cm-1$ have been measured. These lines were assigned to the 1-0. 2-1, 3-2, and 4-3 bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C32S$, the 1-0 and 2-1 bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C32S$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C32S$ and the 1-0 band of $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C33S$. These new data have been combined with the previous infrared and microwave results to determine Dunham coefficients $(Yij)$ for all four molecules. Furthermore, the Dunham potential function coefficients $(a1,a2,a3,a4)$ have also been determined.