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

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.
[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
[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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