Knowledge Bank

The vibration-rotation spectrum of silicon monosulfide, an important astrophysical molecule, has been observed in emission between 640 and $800cm-1$ using the Fourier transform spectrometer associated with The McMath Solar Telescope at Kitt Peak. Gas phase SiS was produced by the reaction of solid silicon with silicon disulfide. $SiS2$. in an alumina heat pipe oven. The mixture was heated to $1000\circ C$ and the mission was focused on the entrance aperture of the Fourier transform spectrometer. More than two thousand four hundred lines were assigned to four isotopomers $(28Si32S,28S34Si,29Si32S$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}Si32S$). The data for all the isotopomers series were fitted together using the mass-reduced Dunham expression including Watson's Born-Oppenheimer breakdown coefficients.