Quadrupole Hyperfine Structure and Splitting of Δ-Levels in the Microwave Spectra of KOH,RbOH and CsOH in the 100 GHz Region

Abstract

Abstract Hyperfine structure of rotational transitions of KOH, RbOH and CsOH in various υ2-and l-states has been carefully measured in the 100 GHz range. From the observed splittings and broadenings information about quadrupole coupling constant (eqQ) of the K nucleus in KOH and about the spacing (EΔ - EΣ) between Σ and Δ levels in the vibrational spectrum of KOH, RbOH and CsOH has been derived. The measured value of the eqQ of KOH is close to that of KF. The separation between Σ and Δ levels is found to be rather similar for the group of the alkali hydroxides in­ creasing gradually when progressing from LiOH to CsOH.