Methane line parameters from 3700 to 4136 cm(-1).
The positions and strengths of ~1900 absorption lines of methane between 3700 and 4136 cm(-1) were measured experimentally to provide a reference line list for the identification of weak CH(4) features in planetary spectra. The line parameters were obtained at room temperature with accuracies of 0.0002-0.003 cm(-1) for positions and +/-3-40% for strengths using spectra recorded at 0.011-cm(-1) resolution (unapodized) with a Fourier transform spectrometer at Kitt Peak National Observatory/National Solar Observatory. Individual line strengths range from 2 x 10(-5) to 1.3 x 10(-2) cm(-2) atm(-1) at room temperature, and the sum of the observed strengths is 1.42 cm(-2) atm(-1) at 297 K. All measurements are reported in natural isotopic abundance.
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Brown