# LINE STRENGTHS OF METHANE IN THE 2.2 MICRON REGION

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 Title: LINE STRENGTHS OF METHANE IN THE 2.2 MICRON REGION Creators: Hilico, J. C.; Loete, M.; Brown, L. R. Issue Date: 1985 Publisher: Ohio State University Abstract: Absolute strengths and wavenumbers of 1500 vibration-rotation lines of natural methane have been measured at 297 K in the spectral region $4433-4719 cm^{-1}$ from high resolution spectra recorded on the F. T. spectrometer at Kitt Peak. Accuracy of the strengths can be estimated to 3% for clean lines. Most of these lines belong to the $\nu_{z} + \nu_{3}$ combination band. The upper state levels being largely perturbed, the analysis of strengths on the basis of an isolated band model -the only one presently available- requires a second order development of the dipole moment including 8 parameters. The strengths of a severe selection of 229 single lines are reproduced with a relative standard deviation of 5.4 % whereas reduced developments with only 3 parameters (first order) or 1 parameter (zero order) lead to 16% and 133% respectively.The obtained parameters are used to predict the associated $\nu_{3} - \nu_{z}$ difference band. Description: Author Institution: Laboratoire de Spectronomie Mol\'eculaire, Universit\'e de DIJON; Laboratoire de Spectronomie Mol\'eculaire, Universit\'e de DIJON; Laboratoire de Spectronomie Mol\'eculaire, Jet Propulsion Laboratory URI: http://hdl.handle.net/1811/12082 Other Identifiers: 1985-FB-9