HIGH-RESOLUTION INFRARED STUDY OF THE NU-2+NU-3 BAND OF CF3I

The gas-phase infrared spectrum of CF3I has been studied in the ν2 + ν3 region between 1030 and 1035 cm-1 with a resolution of about 0.002 cm-1 employing a tunable diode laser spectrometer. The measurements have been performed at low temperature ({reversed tilde equals}230 K) and the K structure in many R(J) manifolds has been resolved and analyzed. The band has been found perturbed by ν2 + ν6 through Coriolis resonance and the maximum J and K values reached in the analysis were 62 and 30, respectively. The observed transitions have been fitted (σ {reversed tilde equals} 13 × 10-4 cm-1) to the excited state parameters up to the quartic coefficients and a set of effective molecular constants for the ν2 + ν3 band has been determined. The J structure of residual weak features due to ν2 + 2ν3 - ν3 has also been identified and spectroscopic constants have been derived. © 1991.