Molecular spectra and X-ray study of the alkali hydrogen selenites MHSeO3

Article abstract of DOI:10.1016/0022-4596(88)90253-8

A study of the molecular spectra confirmed that the protons are localized close to one of the oxygen atoms in the hydrogen bonds in the compounds LiHSeO₃, KHSeO₃, RbHSeO₃, and CsHSeO₃. The character of the NaHSeO₃ spectrum indicates that part of the protons are in ordered positions, which is in agreement with the results of the structural analysis published earlier. Down to a temperature of 77 K, no phase transition connected with a change in the proton ordering was found during the study of the molecular spectra of the test compounds. X-ray diffraction confirmed structural isomorphy of RbHSeO₃ with KHSeO₃.