High sensitivity CRDS of CO2 in the 1.74 μM transparency window. A validation test for the spectroscopic databases

Mondelain, Didier

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https://hdl.handle.net/2142/100561 Copy

Description

Title

High sensitivity CRDS of CO2 in the 1.74 μM transparency window. A validation test for the spectroscopic databases

Author(s)

Mondelain, Didier

Contributor(s)

• Campargue, Alain
• Perevalov, Valery
• Kassi, Samir
• Karlovets, Ekaterina
• Čermák, Peter

Issue Date

2018-06-19

Keyword(s)

Rotational structure/frequencies

Abstract

The very weak absorption spectrum of natural CO2 near 1.74 µm (5702 - 5879 cm−1 ) is studied at high sensitivity. The investigated region corresponds to a transparency window of very weak opacity which is of particular interest for Venus. Very weak lines with intensity value as low as 10−30 cm/molecule at 296 K are detected by Cavity Ring Down Spectroscopy. On the basis of the predictions of effective Hamiltonian models, 1135 lines of six carbon dioxide isotopologues - 12C 16O2, 13C 16O2, 16O 12C 18O, 16O 12C 17O, 16O 13C 18O and 16O 13C 17O - were rovibrationnally assigned to 26 bands. The accurate spectroscopic parameters of 16 bands are determined from standard band-by-band analysis (typical rms deviations of the line positions are 8 × 10−4 cm−1 ). These newly observed bands include perturbed bands, weak hot bands and bands of minor isotopologues (in particular 16O 12C 18O in natural abundance) and provide critical validation tests for the most recent spectroscopic databases. The comparison to the Carbon Dioxide Spectroscopic Databank (CDSD), HITRAN2016 database and recent ab initio line lists will be presented. Deficiencies are evidenced for some weak perpendicular bands of the HITRAN2016 list and identified as due to inaccurate CDSD intensities which were preferred to ab initio intensities. New results based on 18O enriched CO2 spectra will also be detailed.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100561

DOI

10.15278/isms.2018.TJ01

Copyright and License Information

Copyright 2018 Didier Mondelain

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