Infrared absorption studies in the vapor phase of CF3Br: Spectra between 1800 and 400 cm−1

Abstract An extensive investigation of the ir spectrum in the gas phase of CF 3 Br was made under medium resolution in the range 1800 to 400 cm −1 . The results of this study enabled an unambiguous and self-consistent assignment of a high number of fundamentals, overtones, combinations, and “hot” bands absorbing in different regions to be made. The vibrational origin of the low-lying ν 3 fundamental was evaluated by applying the Ritz Combination Principle; for bands where this mode is somehow involved the 79 81 Br isotopic shift was observed. Molecular parameters obtained from the rotational structure of the perpendiculars ν 5 and ν 2 + ν 5 are also presented.