FTIR spectra of water–hydrogen fluoride complexes in solid argon. Evidence for inversion doubling in the HF librational modes of H2O– –HF

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Abstract
Co‐condensation of dilute Ar/HF and Ar/H2O samples at 12 K produces a number of sharp new infrared absorptions. The major species, which exhibits a strong 3554.7 cm−1 band and two quartets beginning at 753.1 and 635.6 cm−1, is identified as H2O– –HF. Isotopic substitution in the base submolecule changes the splitting in the latter multiplets and provides evidence for inversion doubling of the H–F librational modes in the H2O– –HF complex. The reverse complex HF– –HOH, identified at 3915.5 cm−1, exhibits a stronger interaction when HOH is replaced by DOD. Two H–F stretching fundamentals, which show small D2O shifts, increased markedly on sample warming and are assigned to the 1:2 complex H2O– –HF– –HF with an open structure.

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