High resolution infrared spectrum and analysis of the v 2 band of CF 3 I

The vibro-rotational spectrum of CF3I has been recorded in the 13·5?m (733-752 cm-1) region using a tunable diode laser spectrometer. The K-structure of the v 2 fundamental vibration could be resolved for a series of P(J) and R(J) multiplets, from P(61) up to R(70). Furthermore, many P(J) and R(J) multiplets were assigned to the hot-bands v 2 + v 6 - v 6 and v 2 + v 3 - v 3. Accurate molecular constants were determined from a least squares fit of the observed transition frequencies. In particular, band-origins of 743·3680(5) cm-1, 742·6177(8) cm-1 and 741·9132(9) cm-1 were established for the v 2, v 2 + v 6 - v 6 and v 2 + v 3 - v 3 bands, respectively.