Knowledge Bank

Twelve sulfur-containing carbon chains have recently been detected and spectroscopically characterized in our laboratory by Fourier transform microwave spectroscopy. These include: the singlet chains $C7S$ and $C9S$; the triplet chains $C6S$ and $C8S$; the free radicals $HC5S$, $HC6S$, $HC7S$, and $HC8S$; and the asymmetric tops $H2C4S$, $H2C5S$, $H2C6S$, and $H2C7S$. In addition, all three fine structure ladders of triplet $C4S$ have now been observed, and the two fine-structure constants $\gamma$ and $\lambda$ determined to high accuracy. An experimental structure of $C5S$ has also been derived on the basis of the singly-substituted isotopic species which were observed in natural abundance. A summary of these and other recent result will be presented.