Air component foreign broadening contributions to carbon dioxide collisional line shapes in the (30012) ← (00001) band

Adkins, Erin M.

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https://hdl.handle.net/2142/107346 Copy

Description

Title

Air component foreign broadening contributions to carbon dioxide collisional line shapes in the (30012) ← (00001) band

Author(s)

Adkins, Erin M.

Contributor(s)

• Hodges, Joseph T.
• Gamache, Robert R.
• Vispoel, Bastien
• Long, David A.

Issue Date

2020-06-26

Keyword(s)

• Lineshapes
• Collisional effects

Abstract

Line-by-line spectroscopic databases of CO$_2$ such as those in HITRAN include so many transitions and bands that it is intractable to provide reference data for every transition and relevant collisional partner. To address this dilemma, theoretical line parameters enabling widespread coverage need to be validated in terms of accurate spectroscopic measurements having well-established uncertainties. In this work, we present frequency-agile, rapid scanning cavity ring-down spectroscopy (FARS) measurements of CO$_{2}$ (30012) $\leftarrow$ (00001) band transitions up to J'' = 50. These data correspond to foreign broadening by four gas mixtures: air, N$_2$, and two Ar-enriched synthetic air samples, with each sample containing CO$_2$ at a mole fraction near atmospheric levels. The measured O$_2$, N$_2$, and Ar foreign broadening parameters were determined using a NIST-developed multi-spectrum fitting algorithm which used appropriate constraints for pressure, temperature, and sample composition. These experimental results are compared to theoretical semiclassical half-widths$^{1}$ as well as to literature values. 1. R. R. Gamache, J. Lamouroux, A. L. Laraia, J.-M. Hartmann and C. Boulet, Journal of Quantitative Spectroscopy and Radiative Transfer 113 (11), 976-990 (2012).

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/107346

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