Structure of the Alkali Hydroxides. II. The Infrared Spectra of Matrix-Isolated CsOH and CsOD

Abstract

The infrared spectra of matrix isolated CsOH and CsOD have been observed. Both the CsO stretching and the bending mode have been assigned for each species. The Cs–O stretching mode ${\nu }_2$ is observed at 335.6 and 330.5 cm⁻¹ for CsOH and CsOD, respectively; the bending mode ${\nu }_2$ is observed at 306 and 226 cm⁻¹, respectively. Combination of the infrared results with previous microwave measurements indicates that the equilibrium configuration of CsOH probably does not deviate significantly from linearity. The assumption of a linear model with a harmonic bending potential leads to a bending force constant of 0.047 mdyn· Å.