Analysis of FTIR spectra of CH 279Br 35Cl; the ν4 and ν5 fundamentals and their hot-bands ν4+ ν6− ν6 and ν5+ ν6− ν6

Abstract

The infrared spectrum of isotopically pure CH 2 79BrCl has been recorded at a resolution of 0.0023 cm −1 (FWHM) in the range 550–800 cm −1 with a Bruker IFS 120 HR Fourier transform spectrometer in Wuppertal. Here we report the full rotational analysis of the ν 4 and ν 5 fundamentals and of the hot-bands ν 4+ ν 6− ν 6 and ν 5+ ν 6− ν 6. Ground state combination differences were constructed for all bands, yielding improved ground state constants, up to quartic terms, as well as reliable rotational constants for the ν 4, ν 5, and ν 6 states.