The absorption spectrum of acetylene near 1 µm (9280–10, 740 cm-1) (II): Line intensities. (August 2018)

• Record Type: Journal Article
• Authors: Lyulin, O.M.; Campargue, A.
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 215(2018)
• Page Start: 51
• Page End: 58
• Publication Date: 2018-08
• Subjects: Acetylene -- C2H2 -- Line intensity -- FTS -- Spectroscopic database -- HITRAN; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2018.04.025
• Languages: English
• ISSNs: 0022-4073

Abstract

Highlights: Line intensity analysis of the high-resolution FTS absorption spectrum of acetylene near 1 µm. Band strengths and Herman–Wallis coefficients of 39 bands are derived. An empirical database is constructed for the 9450–10, 740 cm -1 interval. It includes 2774 lines belonging to 32 12 C2 H2 bands and seven 12 C 13 CH2 bands. Εffective dipole moment parameters are derived. Abstract: In a companion paper, rovibrational assignments of acetylene in the 9280–10, 740 cm –1 region were extended on the basis of a long path absorption spectrum recorded by Fourier-transform spectroscopy. Thirty-three and seven bands of 12 C2 H2 and 12 C 13 CH2 were assigned, respectively, twelve 12 C2 H2 bands being newly assigned. In the present work, the vibrational transition dipole moments squared and Herman–Wallis coefficients of the bands are derived from a fit of the measured intensity values. An empirical recommended line list is provided with positions calculated using empirical spectroscopic band parameters and intensities calculated using the derived Herman–Wallis coefficients. As a result the constructed line list in the 9450–10, 740 cm -1 region includes a total of 2774 lines belonging to 32 bands of 12 C2 H2 and seven bands of 12 C 13 CH2 . For comparison the HITRAN database in the same region includes 305 lines of 4 bands, all belonging to 12 C2 H2 . The recommended acetylene line list is compared to the HITRAN line list and to the Acetylene Spectroscopic Database (ASD) constructed using the global effective operator approach. The measured bands belong to the ΔP = 15 and 16 series of bands where P = 5 V 1 + 3 V 2 + 5 V 3 + V 4 + V 5 is the polyad quantum number. An improved set of ΔP = 15 effective dipole moment (EDM) parameters is derived from a fit of the measured intensity values. The ΔP = 16 EDM parameters are derived for the first time. The derived sets of EDM will allow extending the Acetylene Spectroscopic Database at higher energy. Graphical abstract: Image, graphical abstract