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Updated: Jun 14, 2026

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Line parameters of methane from 2385 to 3200 cm(-1)
Abstract:
New line parameters of the methane spectrum have been incorporated in the AFGL compilation for the 2385-3200-cm(-1) region and were determined from data recorded at 0.01- and 0.02-cm(-1) resolution. Observed line positions and strengths are given for approximately 8076 absorptions with strengths >3.3 x 10(-24) cm/molecule (8.2 x 10(-5) cm(-2) atm(-1)). Lower state energies are given for 97% of the absorptions listed. Most of the lower states are determined through assignment of seven bands of (12)CH(4) (nu(1), nu(3), 2nu(2), nu(2) + nu(4), 2nu(4), nu(3) + nu(4) - nu(4) and nu(2) + nu(3) - nu(2)), four bands of (13)CH(4) (nu(3), 2nu(4), nu(2) + nu(4) and nu(3) + nu(4) - nu(4)), and three bands of CH(3)D (nu(1), nu(4), and 2nu(5)). A few of the lower state energies are determined experimentally from the data taken at cold sample temperatures.
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