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 × 10-24 cm/molecule (8.2 × 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 12CH4 (ν1, ν3, 2ν2, ν2 + ν4, 2ν4, ν3 + ν4 - ν4 and ν2 + ν3 - ν2), four bands of 13CH4 (ν3, 2ν4, ν2 + ν4 and ν3 + ν4 - ν4), and three bands of CH3D (ν1, ν4, and 2ν5). A few of the lower state energies are determined experimentally from the data taken at cold sample temperatures.
Robert A. Toth, Linda R. Brown, Robert H. Hunt, and Laurence S. Rothman, "Line parameters of methane from 2385 to 3200 cm-1," Appl. Opt. 20, 932-935 (1981)