Microwave Spectrum of Carbon Monsulfide

Abstract

CS was produced by an electrical discharge through C${\mathrm{S}}_2$ and continuously flowed through a conventional Stark spectrometer. The $J=0\mathrm{}\to 1$ transitions of the isotopic species ${\mathrm{C}}^{12}$ ${\mathrm{S}}^{32}$, ${\mathrm{C}}^{12}$ ${\mathrm{S}}^{33}$, ${\mathrm{C}}^{12}$ ${\mathrm{S}}^{34}$, and ${\mathrm{C}}^{13}$ ${\mathrm{S}}^{32}$ were observed in their vibrational ground states. ${\mathrm{C}}^{12}$ ${\mathrm{S}}^{32}$ was also observed in its first excited vibrational state. The spectra yield the following molecular constants: In Mc/sec, $B_e\left({\mathrm{C}}^{12}{\mathrm{S}}^{32}\right)=24\mathrm{}584.352\pm 0.015,$ $B_e\left({\mathrm{C}}^{12}{\mathrm{S}}^{33}\right)=24\mathrm{}381.011\pm 0.027,$ $B_e\left({\mathrm{C}}^{12}{\mathrm{S}}^{34}\right)=24\mathrm{}190.198\pm 0.014,$ $B_e\left({\mathrm{C}}^{13}{\mathrm{S}}^{32}\right)=23\mathrm{}205.215\pm 0.020,$ $\alpha \left({\mathrm{C}}^{12}{\mathrm{S}}^{32}\right)=+177.544\mathrm{}\pm 0.026,$ $eqQ\left({\mathrm{C}}^{12}{\mathrm{S}}^{33}\right)=+12.835\mathrm{}\pm 0.026,$ Dipole moment = 1.97 ±0.02 Debye units, Equilibrium bond distance = 1.5349±0.0002 A, Where $B_e=\mathrm{equilibrium}\mathrm{rotational}\mathrm{constant}$, $\alpha =\mathrm{v}\mathrm{i}\mathrm{b}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}-\mathrm{r}\mathrm{o}\mathrm{t}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}\mathrm{i}\mathrm{n}\mathrm{t}\mathrm{e}\mathrm{r}\mathrm{a}\mathrm{c}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}\mathrm{c}\mathrm{o}\mathrm{n}\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{n}\mathrm{t}$, and $eqQ=\mathrm{electric}\mathrm{quadrupole}\mathrm{coupling}\mathrm{constant}$.