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Methane line parameters from 3700 to 4136 cm−1

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Abstract

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 CH4 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 × 10−5 to 1.3 × 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.

© 1988 Optical Society of America

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