Effective line intensity measurements of trans-nitrous acid (HONO) of the ν1 band near 3600 cm−1 using laser difference-frequency spectrometer. (July 2017)

• Record Type: Journal Article
• Authors: Maamary, Rabih; Fertein, Eric; Fourmentin, Marc; Dewaele, Dorothée; Cazier, Fabrice; Chen, Changshui; Chen, Weidong
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 196(2017)
• Page Start: 69
• Page End: 77
• Publication Date: 2017-07
• Subjects: HONO -- Line intensity -- infrared -- DFG -- QCL -- Cross-measurement -- Optical monitoring; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2017.03.041
• Languages: English
• ISSNs: 0022-4073

Abstract

Abstract: We report on the measurements of the effective line intensities of the ν1 fundamental band of trans -nitrous acid ( trans -HONO) in the infrared near 3600 cm −1 (2.78 µm). A home-made widely tunable laser spectrometer based on difference-frequency generation (DFG) was used for this study. The strengths of 28 well-resolved absorption lines of the ν1 band were determined by scaling their absorption intensities to the well referenced absorption line intensity of the ν3 band of trans- HONO around 1250 cm −1 recorded simultaneously with the help of a DFB quantum cascade laser (QCL) spectrometer. The maximum measurement uncertainty of 12% in the line intensities is mainly determined by the uncertainty announced in the referenced line intensities, while the measurement precision in frequency positions of the absorption lines is better than 6×10 −4 cm −1 . The cross-measurement carried out in the present work allows one to perform intensity calibration using well referenced line parameters.