The Electric Resonance Method of Radiofrequency Spectroscopy The Moment of Inertia and Electric Dipole Moment of CsF

Abstract

This paper describes a new method of radiofrequency spectroscopy in which transitions between the energy levels of a single rotational state of a linear rotator in an electric field are caused by a superimposed radiofrequency field. The method utilizes a molecular beam and has been applied to the measurement of the moment of inertia, $I$, and the electric dipole moment, $\ensuremath{\mu}$, of CsF. Values for these quantities are: $I=(187\ifmmode\pm\else\textpm\fi{}22){10}^{\ensuremath{-}40}$ g ${\mathrm{cm}}^{2}$ and $\ensuremath{\mu}=7.3\ifmmode\pm\else\textpm\fi{}0.5$ Debye. The internuclear distance, derived from the moment of inertia, is 2.60\ifmmode\pm\else\textpm\fi{}0.16 angstroms.