CAVITY RING-DOWN SPECTROSCOPY OF CO2 NEAR λ = 2.06 μm

Fleurbaey, Helene

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https://hdl.handle.net/2142/107692 Copy

Description

Title

CAVITY RING-DOWN SPECTROSCOPY OF CO2 NEAR λ = 2.06 μm

Author(s)

Fleurbaey, Helene

Contributor(s)

Hodges, Joseph T.; Fleisher, Adam J.; Adkins, Erin M.; Yi, Hongming

Issue Date

26-Jun-20

Keyword(s)

Intensities, transition moments, cross sections

Abstract

The 20013 $\leftarrow$ 00001 rotation-vibration band of \chem{^{12}C^{16}O_2} near 2.06 $\mu$m is widely used for remote sensing of carbon dioxide concentration in the terrestrial atmosphere. The high accuracy target of such applications (0.3 \% for the OCO-2 satellite mission) motivates reducing the uncertainties of relevant line intensities in currently available line lists. To this end, we present transition intensities measured by frequency-stabilized cavity ring-down spectroscopy for 39 transitions of the 2.06 $\mu$m \chem{CO_2} band. The relative combined standard uncertainty of the line intensities is estimated to be $u_r$ = 0.09 \%. To determine the integrated band intensity from these measurements, two approaches were used to model the $J$-dependence of the intensities. The first approach is based on a one-dimensional quantum mechanical model with Herman-Wallis rotation-vibration corrections, whereas in the second approach, we fit a single factor to rescale the intensities derived from the ab initio dipole moment surface (DMS) of Zak et al. [JQSRT 177, 31-42 (2016)]. Although the two approaches yield equally adequate representations of the observed $J$-dependence, we consider the rescaled ab initio DMS intensities to be the more physically general representation of our data. The results will be compared to existing databases and other experiments.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

English

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http://hdl.handle.net/2142/107692

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