Issue 26, 2017

Conformational landscape of the SF6 dimer as revealed by high resolution infrared spectroscopy and complexation with rare gas atoms

Abstract

Taking advantage of a versatile set-up, combining pulsed pin hole or slit nozzle supersonic expansion with an external cavity quantum cascade laser, the rovibrational absorption spectrum of the SF6 dimer in the ν3 mode region has been revisited at high resolution under various experimental conditions in SF6:He mixtures. Two new rotationally resolved spectral bands have been identified in the range of the parallel band of the dimer spectrum in addition to that previously reported. Among these three spectral features, two of them are assigned to conformations of the dimer (noted #1 and #2), clearly distinguished from their different S–S interatomic distances, i.e. 474 and 480 pm respectively. The third one is assigned to a (SF6)2–He complex, from comparison with additional experiments in which (SF6)2–Rg heterotrimers (Rg = Ne, Ar, Kr, Xe) are observed. A schematic picture of the potential energy landscape of the SF6 dimer in terms of a nearly flat surface is proposed to account for the conformational relaxation observed in the expansions and for the structure of the (SF6)2–Rg heterotrimers, which are exclusively formed from the conformer #2 dimer. Although modelling qualitatively supports this picture, much effort has still to be achieved from a theoretical point of view to reach a quantitative agreement with the present benchmark experimental data both in terms of structure and energetics.

Graphical abstract: Conformational landscape of the SF6 dimer as revealed by high resolution infrared spectroscopy and complexation with rare gas atoms

Article information

Article type
Paper
Submitted
18 Apr 2017
Accepted
13 Jun 2017
First published
14 Jun 2017

Phys. Chem. Chem. Phys., 2017,19, 17224-17232

Conformational landscape of the SF6 dimer as revealed by high resolution infrared spectroscopy and complexation with rare gas atoms

P. Asselin, A. Potapov, A. C. Turner, V. Boudon, L. Bruel, M. Gaveau and M. Mons, Phys. Chem. Chem. Phys., 2017, 19, 17224 DOI: 10.1039/C7CP02529G

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