High-resolution infrared spectrum and analysis of the nu2 band of CF3Cl

The rotational structure of the ?2 band of CF3Cl, with natural isotopic abundance, has been investigated using a tunable diode laser spectrometer. The spectra have been obtained for a low-temperature (?200 K) sample, to reduce the interfering contributions of hot-band transitions. Due to the very small value of the (?A - ?B) constant for both isotopic species, the K structure of most P(J) and R(J) multiplets is generally not resolvable. Only for CF335Cl, the K structure could be resolved for P(J) multiplets with J>=55. Molecular constants for the ?2 fundamental of both isotopic species have been obtained using least-squares fitting routines in combination with band contour simulations for unresolved K structure.