Neutron inelastic scattering studies on the hydrogen dihalides

Abstract

In this paper we report the results of an examination, both by time of flight, energy-gain inelastic neutron scattering, and by energy-loss inelastic neutron scattering spectroscopy of the vibrational modes of a very wide range of bihalide salts (e.g. NaHF₂, KHF₂, CsHCl₂, CsHClBr, CsHBr₂, CsHClI, (CD₃)₃NC₂D₅HCl₂, (CD₃)₄NHCl₂, CsCl⅓(H₃O⁺HCl^–₂), CsBr⅓(H₃O⁺HBr^–₂). The neutron scattering spectra serve as a diagnostic as to whether the bihalide ion is centrosymmetric or not. In all cases they permit an unequivocal identification of the bending mode of the bihalide ions.