The region of the 3ν3 band of methane |
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Authors: | Gérard Pierre Jean-Claude Hilico Catherine de Bergh Jean-Pierre Maillard |
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Institution: | 1. Laboratoire de Spectronomie Moléculaire, Equipe de recherche associée au CNRS, 6, Boulevard Gabriel, 21100 Dijon, France;2. Observatoire de Meudon, section d''astrophysique, 92190 Meudon, France |
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Abstract: | The spectrum of methane near 9000 cm?1, the region of the 3ν3 band, has been recorded at Meudon Observatory with a Fourier transform spectrometer under high resolution. Intensity measurements at two different temperatures, 149 and 295 K, have allowed us to identify two new vibration bands by determining the lower-state quantum numbers J of the transitions. About 100 lines are now assigned in this range, including P and Q branches. Furthermore, the first detailed rotational analysis of the 3ν3 band has been made; nine parameters of the band have been determined. The standard deviation of the differences between observed and computed wavenumbers for 45 lines of the 3ν3 band is only 0.045 cm?1. It is found that the observed 45 lines of the 3ν3 band correspond to the sublevel l3 = 3 and Cv = F2. |
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