The Moment of Inertia and Electric Dipole Moment of CsF from Radiofrequency Spectra

Abstract

The electric resonance method of molecular beam spectroscopy was used to obtain spectra resulting from induced changes in the space-quantization of the rotational state $J=1$ of CsF in a homogeneous electric field. An analysis of the spectra for several values of the field intensity and for two different vibrational states gave the following molecular constants, ${I}_{e}=(151\ifmmode\pm\else\textpm\fi{}6){10}^{\ensuremath{-}40}$ g ${\mathrm{cm}}^{2}$, ${\ensuremath{\mu}}_{e}=(7.88\ifmmode\pm\else\textpm\fi{}0.17){10}^{\ensuremath{-}18}$ e.s.u., ${B}_{e}=(185\ifmmode\pm\else\textpm\fi{}7){10}^{\ensuremath{-}3}$ ${\mathrm{cm}}^{\ensuremath{-}1}$, ${\ensuremath{\alpha}}_{e}=(1.85\ifmmode\pm\else\textpm\fi{}0.19){10}^{\ensuremath{-}3}$ ${\mathrm{cm}}^{\ensuremath{-}1}$, ${r}_{e}=(2.34\ifmmode\pm\else\textpm\fi{}0.05){10}^{\ensuremath{-}8}$ cm, ${\ensuremath{\omega}}_{e}=(270\ifmmode\pm\else\textpm\fi{}30)$ ${\mathrm{cm}}^{\ensuremath{-}1}$. ${I}_{e}$ is the moment of inertia, ${\ensuremath{\mu}}_{e}$ is the electric dipole moment, ${B}_{e}$ and ${\ensuremath{\alpha}}_{e}$ are rotational constants, ${r}_{e}$ is the internuclear distance and ${\ensuremath{\omega}}_{e}$ is the vibrational constant.