# DIJON THEORETICAL AND EXPERIMENTAL STUDY OF LINE STRENGTHS IN THE $\nu_{3} - \nu_{4}$ HOT BAND OF METHANE

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 Title: DIJON THEORETICAL AND EXPERIMENTAL STUDY OF LINE STRENGTHS IN THE $\nu_{3} - \nu_{4}$ HOT BAND OF METHANE Creators: Hilico, J. C.; Loete, M.; Brown, L. R. Issue Date: 1983 Publisher: Ohio State University Abstract: The $\nu_{3} - \nu_{4}$ hot band of methane is one of the main absorbing features in the $5-6 \mu m$ region which corresponds also to the $\nu_{2}$ R-Branch. Absolute intensities of rotational lines of this band have been measured and then analysed on the basis of the general expansion of the dipole moment operator in $XY_{4}$ molecules [1], using both spherical and tetrahedral formalism. It will be shown that the first term (in q3 q4) in the transformed dipole moment operator is not sufficient and that the three first order intensity parameters are necessary to reproduce the observed strengths. Using the spherical scheme, the usual assumption that (J, R, C, n) are good quantum numbers” in the two involved vibrational levels $(\nu_{3} = 1)$ and $(\nu_{4} = 1)$ [2] is also found to be not sufficient. [1] M. LHETE. J. Can. Phys., in press. [2] D. PASCAUD and M.DANG-NHU, J. Mol. Spectrose. 69, 141-158 (1978) Description: [1] M. LHETE. J. Can. Phys., in press. [2] D. PASCAUD and M.DANG-NHU, J. Mol. Spectrose. 69, 141-158 (1978) Author Institution: Laborateire de Spectronomie, Mol\'eculaire 6; Jet Propulsion Laboratory, California Institute of Technology URI: http://hdl.handle.net/1811/12020 Other Identifiers: 1983-WE-05