High Resolution Spectroscopy of CF₃Br by Diode Laser in the Frequency Range 1070–1090 cm⁻¹

Abstract

The IR absorption spectra of gaseous CF₃Br expanded in a molecular jet have been recorded with a linewidth of about 0.002 cm⁻¹. The rotational K-structure of the ν₁ fundamental has been resolved and the molecular constants ΔB and ΔA have been determined with an accuracy better than 5 x 10⁻⁶ cm⁻¹. Spectral features belonging to the ν6- and ν3-hotbands have been identified. For CF₃B79r (CF₃B81r) improved values of the vibrational origins for the fundamental ν₁ = 1084.768(2) cm⁻¹ (1084.520(2) cm⁻¹) and for its hotbands ν3+ν1←ν3 = 1081.709(80) cm⁻¹ (1081.065(40) cm⁻¹) and ν6+ν1←ν6 = 1083.533(4) cm^-1 (1083.288(4) cm^-1) have been determined.