Title

Tunable far infrared laser spectroscopy of a ternary van der Waals cluster Ar2HCl: A sensitive probe of three-body forces

Abstract

The first far infrared intermolecular vibration—rotation spectrum of the ternary van der Waals cluster has been measured near 39.5 cm-1 and assigned to an a-type [Sum] bending vibration of Ar2HCl. Spectra of both chlorine isotopes were observed and nuclear quadrupole hyperfine structure was resolved. Values of the fitted constants (rotational constants, hyperfine projections) evidence large amplitude out-of-plane motion, and demonstrate the sensitivity of spectroscopic observables to the three body forces operative in the Ar2HCl system. Spectroscopic predictions calculated by Hutson et al. from pairwise-additive and ‘‘three-body’’ corrected potential energy surfaces [J. Chem. Phys. 90, 1337 (1989)] are compared to experimental results.

Publisher

AIP Publishing

Publication Date

1-1-1991

Publication Title

Journal of Chemical Physics

Department

Chemistry and Biochemistry

Document Type

Article

DOI

10.1063/1.460324

Keywords

Infrared spectra, Molecular Clusters, Argon complexes, Hydrochloric acid, Hyperfine structure, Laser spectroscopy, Chlorine 35, Chlorine 37, Vibrational states, Rotational states, Energy-level transitions, Isotope effects

Language

English

Format

text

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