Rovibrational analysis of the ν1 fundamental of CF3Cl from diode laser spectra in a supersonic slit-jet expansion

Abstract

Spectra of the ν₁ fundamental band of CF₃Cl (CFC-13), with natural isotopic abundance, were recorded with a tunable diode laser spectrometer in the range 1100–1116 cm⁻¹ using a supersonic pulsed slit-jet expansion. A rotational temperature of about 50 K was reached and a significant simplification of the spectra was achieved. The reduced Doppler broadening obtained using the slit source led to a FWHM up to 0.0007 cm⁻¹ and so it was possible to resolve almost completely the K-structure in the P(J) and R(J) clusters for the first time. From the final fit of the assigned transitions a reliable set of molecular constants including the quartic centrifugal distortion coefficients for the v₁ = 1 state of CF₃³⁵Cl and CF₃³⁷Cl has been obtained.