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 Title: MOLECULAR LINE INTENSITIES OF CARBON DIOXIDE IN THE 1.6 μm REGION DETERMINED BY CAVITY RINGDOWN SPECTROSCOPY Author(s): Reed, Zachary Contributor(s): Hodges, Joseph T.; Long, David A. Subject(s): Small molecules Abstract: Here we present some recent advances in frequency stabilized cavity ring-down spectroscopy (FS-CRDS) measurements of molecular line intensities of carbon dioxide in the (30012)$\leftarrow$ (00001), the (30013)$\leftarrow$(00001), and the (30014)$\leftarrow$(00001) bands near 1.6 $\mu$m. These measurements were performed near 296K using a frequency stabilized cavity ringdown spectrometer [1]. Additional independent measurements were performed on a frequency agile rapid scanning (FARS) CRDS [2]. We have compared the line intensities obtained from Hartmann Tran Profile (HTP) fits of the measured spectra to several spectroscopic databases, including UCL (ie, HITRAN2016) [3]. The overall agreement between these results and the ab initio calculations of Zak et al is excellent [3], although some individual transitions show deviations of up to 1\%. The intensities for the (30012)$\leftarrow$(00001) show average agreement at the 0.1\% level. Preliminary measurements on the (30013)$\leftarrow$(00001), and the (30014)$\leftarrow$(00001) bands in this region also show good agreement with the ab initio of Zak et al for the (30013)$\leftarrow$(00001), but considerably poorer agreement for the (30014)$\leftarrow$(00001) band. No significant J-dependence is observed for any of the three bands. This work demonstrates significant improvement in experimental determination of important CO$_{2}$ line intensities in the 1.6 $\mu$m region. It also demonstrates that it may be feasible for ab initio theory to provide sufficiently accurate results for global determinations of line intensities in the near future. [1] H. Lin, Z. D. Reed, V. T. Sironneau, and J. T. Hodges, J. Quant. Spectrosc. Radiat. Transfer 161, 11-20 (2015). [2] G. W. Truong, K. O. Douglass, S. E. Maxwell, R. D. van Zee, D. F. Plusquellic, J. T. Hodges, and D. A. Long, Nat. Photonics 7, 532-534 (2013). [3] E. J. Zak, J. Tennyson, O. L. Polyansky, L. Lodi, N. F. Zobov, S. A. Tashkun, and V. I. Perevalov, J. Quant. Spectrosc. Radiat. Transfer 189, 267-280 (2017). Issue Date: 06/20/18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/100695 DOI: 10.15278/isms.2018.WH09 Other Identifier(s): WH09 Date Available in IDEALS: 2018-08-172018-12-12
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