Line assignments and intensities of the ν2 + ν3 − ν2 band of 12CH4

As part of a comprehensive effort to compile line parameters of methane from 2400 to 3200 cm^?1, the P and R branches of the ν₂ + ν₃ ? ν₂ band of CH₄ at 3010 cm^?1 were assigned through upper state J = 9. The process utilized the analysis of ν₂ + ν₃ at 4544 cm^?1 by J. C. Hilico, J. Degni, J. P. Champion, and G. Guelachvili (J. Mol. Spectrosc.81, 277–302 (1980)) and the ν₂ levels derived from the infrared spectrum by Margolis (in preparation) to predict the positions of the hot band. Experimentally determined lower-state energies were used to confirm assignments, and line intensities of the 300 transitions assigned are observed on the order of 10^?3 cm^?2 atm^?1 or less.