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Title:Measurements Of New Line Positions And Effective Line Intensities Of Cis-hono Of The ν2 Band Around 1660 cm−1using Quantum Cascade Laser Absorption Spectroscopy
Author(s):Ngo, Nhut Minh
Contributor(s):Chen, Weidong; Coeur, Cécile; Nguyen-Ba, Tong; Houzel, Nicolas; Gou, Qian
Abstract:Observation of \chem{HONO} concentration change in the atmosphere can improve our understanding of atmospheric chemistry details and their effects on the regional air quality and global climate [1]. However, highly desired spectral line parameters of the most intense bands of \chem{HONO} in the mid-IR for optical sensing are not available in the common databases like the HITRAN or the GEISA. We report on recent investigation of about 60 new line positions and their effective line strengths of cis-\chem{HONO} of the \nub{2} band in the range of 1660.0-1662.2 \wn using direct quantum cascade laser absorption spectroscopy coupled to a multi-pass cell (L$_{eff}$ =100 m). The \chem{HONO} absorption frequencies were absolutely determined using a $\lambda$-meter with an accuracy of ~0.002 \wn. The effective line intensities were determined by scaling the measured \chem{HONO} absorption intensities to the line strengths of two previously reported HONO lines located in the same spectral region near 1659.85 \wn [2]. The experimental details and the preliminary results will be presented and discussed. \textbf{Acknowledgments.} The authors thank the financial supports from the regional CPER CLIMIBIO program, the national ANR projects of Labex CaPPA (ANR-10-LABX005) and MULTIPAS-2 (ANR-16-CE04-0012). \textbf{References} [1] B.J. Finlayson-Pitts, and J.N. Pitts, Jr., Chemistry of the Upper and Lower Atmosphere, Academic Press, New York, 273–276 (2000). [2] B.H. Lee, E.C. Wood, J. Wormhoudt, J.H. Shorter, S.C. Herndon, M.S. Zahniser, and J.W. Munger, Effective line strengths of trans-nitrous acid near 1275 \wn and cis-nitrous acid at 1660 \wn, J. Quant. Spectrosc. Radiat. Transfer 113 (2012) 1905-1912.
Issue Date:2021-06-22
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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