Non-additive intermolecular forces from the spectroscopy of van der Waals trimers: far-infrared spectra and calculations on Ar2-DCl

Abstract

The far-infrared vibration-rotation spectrum of the out-of-plane DCl bending band of Ar2-DCl is observed around 36·0 cm-1. The experimental bending frequency, rotational constants and hyperfine coupling constants are compared with the results of calculations employing both pairwise-additive and non-additive interaction potentials. As found previously for Ar2-HCl, there are substantial discrepancies between the experimental results and calculations employing a pairwise-additive potential. To explain the discrepancy it is necessary to include a non-additive term that arises from the interaction of the permanent multipoles of the DCl monomer with an overlap-induced quadrupole on Ar2. The new spectra should prove very valuable in a future determination of the non-additive contribution to the potential.

Publisher

Taylor & Francis

Publication Date

2-1-1994

Publication Title

Molecular Physics

Department

Chemistry and Biochemistry

Document Type

Article

DOI

https://dx.doi.org/10.1080/00268979400100391

Language

English

Format

text

Link to Full Text

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