New analysis of the 2ν4, ν4+ν6, 2ν6, ν3+ν4, ν3+ν6, ν1, ν5, ν2+ν4, 2ν3, ν2+ν6 and ν2+ν3 bands of formaldehyde H212C16O: Line positions and intensities in the 3.5 μm spectral region |
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| Institution: | 1. Laboratoire Inter-Universitaire des Systèmes Atmosphériques (LISA), CNRS, Université Paris XII, 61 avenue du Général de Gaulle, 94010 Créteil cedex, France;2. Laboratoire de Physique Moléculaire et Applications, CNRS, Université Pierre et Marie Curie Case 76, 4, place Jussieu 75252 Paris cedex 05, France;3. Groupe de Spectrométrie Moléculaire et Atmosphérique (G.S.M.A.), U.F.R. Sciences Exactes et Naturelles, Moulin de la Housse B.P. 1039 51687 Reims cedex, France;1. Faculty of Mathematics and Natural Sciences, Jan Długosz University, Armii Krajowej 13/15 Ave., 42-200, Częstochowa, Poland;2. Faculty of Chemistry, Wrocław University of Science and Technology, Smoluchowskiego 23, 50-370 Wrocław, Poland;3. Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 12 Rudolf Weigl St., 53-114 Wrocław, Poland;1. Instituto Superior de Tecnologías y Ciencias Aplicadas (InSTEC), Universidad de La Habana, Ave. Salvador Allende No. 1110, Quinta de los Molinos, La Habana 10400, Cuba;2. Instituto de Física Fundamental, CSIC, Serrano 123, 28006 Madrid, Spain;3. Departamento de Química Física, Facultad de Ciencias Químicas, Universidad Complutense de Madrid (Unidad Asociada I+D+i CSIC), 28040 Madrid, Spain;1. Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan;2. Graduate School of Information Sciences, Hiroshima City University, Hiroshima 731-3194, Japan;3. The Graduate University for Advanced Studies, Kanagawa 240-0193, Japan;1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan 430071, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | This work is mainly motivated by the atmospheric importance of formaldehyde. The 3.5 μm region is indeed commonly used for the infrared detection of this molecule in the troposphere and the line parameters which are presently available in the atmospheric databases for H2CO are of rather poor quality in this spectral range. Using New Fourier transform spectra recorded in LPMA and in GSMA it has been possible to perform an extensive study of the 2ν4, ν4+ν6, 2ν6, ν3+ν4, ν3+ν6, ν1, ν5, ν2+ν4, 2ν3, ν2+ν6 and ν2+ν3 bands of formaldehyde. Combining these data with previous frequency and intensity measurements for the ν3+ν4, ν3+ν6, ν1, ν5, ν2+ν4, 2ν3 and ν2+ν6 bands L.R. Brown R.H. Toth and A.S. Pine J. Mol. Spectosc. 406–428 and references therein] and an adequate theoretical model, it proved possible to reproduce rather satisfactorily the experimental data and to generate a list of line positions and intensities for the 3.5 μm region. The Hamiltonian model accounts for the various Coriolis-type resonances and anharmonic resonances which perturb the energy levels of the 42, 4161, 62, 3141, 3161, 11, 51, 2141, 32, 2161, and 2131 vibrational states. This is also the case for the line intensity calculations, which allow one to reproduce satisfactorily the line-by-line intensity measurements as well as the integrated intensities available in the literature. |
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