The far-IR spectra for NH<sub>4</sub><sup>+</sup> and H<sub>3</sub>O<sup>+</sup> complexes with 18-crown-6 have been obtained and the hydrogen-bond vibrational mode <i>v</i><sub>σ</sub> has been assigned. These results illustrate the suitability of far-IR spectroscopy for exploring crown ether molecular ion interactions.

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