Line list of 12CH4 in the 4300-4600 cm-1 region

Four spectra of normal samples of CH4 in the 4300-4600 cm(-1) region were recorded by using a Fourier transform spectrometer in Reims, France at long paths (202m, 602m, 1604m, and 1804m) and different pressures. Additional spectra of (CH4)-C-12 covering the same region were obtained at 80-123 K, and 93 m path length at SOLEIL Synchrotron in Paris for different pressures and were used to measure low-J lines. Line positions and intensities were retrieved by non-linear least-squares curve-fitting procedures and an- alyzed using effective Hamiltonian and effective dipole transition moment models. A new measured line list contains positions and intensities for 14,151 absorption features. Quantum assignments were made for more than 10,304 transitions of (CH4)-C-12, which represent -99% of the integrated line intensity observed in this region. Some 1699 hot band transitions for (Dyad - Tetradecad) system were assigned. The resulting list of lines is significantly more accurate than previous empirical compilations. Positions of 8605 cold band transitions for (GS - Octad) system were fitted with an RMS standard deviation of 0.0014 cm(-1). The sum of observed intensities between 4300 and 4600 cm(-1) fell within 8% of the predicted value from ab initio variational calculations reported in the TheoReTS database (http://theorets.univ-reims.fr;http://thearets.tsu.ru). (C) 2020 Elsevier Ltd. All rights reserved.