Collision induced absorption of the a1∆g-X3Σ−g band of oxygen near 1.27 μM by cavity ring down spectroscopy

Mondelain, Didier

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https://hdl.handle.net/2142/100558 Copy

Description

Title

Collision induced absorption of the a1∆g-X3Σ−g band of oxygen near 1.27 μM by cavity ring down spectroscopy

Author(s)

Mondelain, Didier

Contributor(s)

• Kassi, Samir
• Campargue, Alain

Issue Date

2018-06-18

Keyword(s)

Linelists, Lineshapes, Collisions

Abstract

Collision induced absorption (CIA) coefficients of the a1∆g-X3Σ − g(v=0-0) band of oxygen have been measured using cavity ring down spectroscopy (CRDS) technique at room temperature. More precisely, the BO2−O2, BO2−N2 and BO2−Air coefficients have been determined with a reduced uncertainty from series of low density spectra (from 0.36 to 0.85 amagat) of pure oxygen and N2+O2 mixture with O2=20.95%. For that 12 distributed feed-back laser diodes were used below 7920 cm−1 together with an external cavity diode laser above this wavenumber. We particularly paid attention to the base line stability (2×10−10 cm−1 ) during the entire measurements. CIA was obtained from the difference between the absorbing samples spectra and argon spectra recorded for the same densities after removal of the local contribution of the absorption lines. The low densities at which the spectra were recorded were very useful to reliably remove this local contribution. The retrieved coefficients were compared to the CIA reported in HITRAN2016. A good overall agreement is found but differences between 5 and 8% for BO2−Air coefficients are observed below 7850 cm−1 .

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100558

DOI

10.15278/isms.2018.MI04

Copyright and License Information

Copyright 2018 Didier Mondelain

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