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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:2018-08-17
2018-12-12


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