Rotational Spectra of RbCl by the Molecular Beam Electric Resonance Method

Abstract

The rotational transitions for which $J=0\ensuremath{\rightarrow}1$ were studied by the molecular beam electric resonance method for the first three vibrational states, $v=0, 1, 2$, of ${\mathrm{Rb}}^{85}$${\mathrm{Cl}}^{35}$ and the ground vibrational state, $v=0$, of ${\mathrm{Rb}}^{87}$${\mathrm{Cl}}^{35}$. The molecular constants are: The quadrupole ($\mathrm{eqQ}$) and spin-rotation ($c$) interaction constants of ${\mathrm{Rb}}^{85}$${\mathrm{Cl}}^{35}$ are: For the $v=0$ state of ${\mathrm{Rb}}^{87}$${\mathrm{Cl}}^{35}$, ${(\mathrm{eqQ})}_{\mathrm{Rb}}=\ensuremath{-}25.485\ifmmode\pm\else\textpm\fi{}0.006$ Mc/sec. The ratio of the Rb quadrupole moments is $\frac{{Q}_{85}}{{Q}_{87}}=2.0669\ifmmode\pm\else\textpm\fi{}0.0005$. The mass ratio of the Rb isotopes is $\frac{{M}_{85}}{{M}_{87}}=0.9770163\ifmmode\pm\else\textpm\fi{}0.0000045$.