Line Intensities in the ν6 Fundamental Band of CH 3Br at 10 μm

Abstract

Fourier transform spectra have been obtained at 296 K at a resolution of 0.002 or 0.004 cm -1 depending on the pressure range. Line positions and intensities of CH 3 79Br and CH 3 81Br belonging to the fundamental band ν 6 were measured and analyzed between 890 and 1080 cm -1. A total of 2896 (2838) line positions with J≤60 and K≤6 was fitted with a root-mean-square deviation of 0.00028 (0.00021) cm -1 for CH 3 79Br and CH 3 81Br, respectively, within the experimental accuracy. The fit to 316 (312) measured intensities yielded values of the dipole moment derivatives of both isotopes with a standard deviation of 5% to be compared to an experimental uncertainty equal to 6% or better. A prediction of the line positions and intensities has been generated for atmospheric purposes with all lines from 820 to 1120 cm -1 with intensities greater than 10 -5 cm -2 atm -1.