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

Autor:	Matthew J. Elrod, Richard J. Saykally, D. W. Steyert
Rok vydání:	1991
Předmět:	Chemistry Intermolecular force Van der Waals molecule General Physics and Astronomy Potential energy symbols.namesake Far infrared symbols Rotational spectroscopy Physical and Theoretical Chemistry Atomic physics van der Waals force Spectroscopy Hyperfine structure
Zdroj:	The Journal of Chemical Physics. 94:58-66
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.460324
Popis:	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 ∑ 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.
Databáze:	OpenAIRE
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