Knowledge Bank

The rotational spectra of the n-alkanes up to n-hexane; cyclo-pentane, -hexane, and -heptane; 1.5-hexadiene; 1.5-hexadiyne; trans-dichloroethylene; cyanurie fluoride; 1,3,5-trifluorobenzene; hexafluorobenzene; as well as carbon dioxide and carbon disulfide have been photographed. In hexafluorobenzene the R-branch with a line spacing of $\sim$ $0.07cm-1$ has been resolved. In the spectra of $CO2$ and $CS2$ the J = odd S-branch pure rotational transitions in the $01^{1}$0 vibrational state have been observed; the molecular constants deduced from these spectra agree well with the values obtained by means of infrared absorption spectra under more favorable conditions. The vibration rotation spectrum of CF, has been photographed resulting in partial resolution of some of the bands. The analysis of the spectra of these and other molecules is in progress.