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Molecular Physics
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High-resolution spectroscopy and analysis of the ν2 + ν3 combination band of SF6 in a supersonic jet expansion†

Authors: Boudon, Vincent; Asselin, Pierre; Soulard, Pascale; Goubet, Manuel; Huet, Thérèse R.; Georges, Robert; Pirali, Olivier; +1 Authors

High-resolution spectroscopy and analysis of the ν2 + ν3 combination band of SF6 in a supersonic jet expansion†

Abstract

Sulphur hexafluoride is a very strong greenhouse gas whose concentration is increasing in the atmosphere. It is detected through infrared absorption spectroscopy in the strong ν3 fundamental region. Due to the existence of low-lying vibrational states of this molecule, however, many hot bands arise at room temperature and those are still not known. We present here a contribution to the elucidation of this hot band structure, by analysing the ν2 + ν3 combination band. We use a supersonic jet expansion high-resolution spectrum at a rotational temperature of ca. 25 K that was recorded thanks to the Jet-AILES setup at the Source Optimisee de Lumiere d'Energie Intermediaire du LURE (SOLEIL) Synchrotron. The simplified structure of this cold spectrum allowed us to assign 444 rovibrational lines and to fit effective Hamiltonian parameters, leading to a very satisfactory spectrum simulation. The parameters obtained in this way allow to calculate the spectrum of the ν3+ν2−ν2 hot band.

Country
France
Keywords

[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], [PHYS.PHYS.PHYS-ATM-PH] Physics/Physics/Atomic and Molecular Clusters, sulphur hexafluoride, [PHYS.PHYS.PHYS-ATM-PH]Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], supersonic jet expansion, [PHYS.PHYS.PHYS-CHEM-PH] Physics/Physics/Chemical Physics, [PHYS.PHYS.PHYS-CHEM-PH] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [ PHYS.PHYS.PHYS-CHEM-PH ] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], greenhouse gas, infrared absorption, [PHYS.PHYS.PHYS-ATM-PH] Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], [ PHYS.PHYS.PHYS-ATM-PH ] Physics [physics]/Physics [physics]/Atomic and Molecular Clusters [physics.atm-clus], tensorial formalism

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
7
Average
Average
Average
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Energy Research