Analysis of the high-resolution 5-μm spectra of the ν4(E) and 2ν2(A1) bands of 12CD3F

Abstract The infrared spectrum of the ν 4 ( E ) and 2 ν 2 ( A 1 ) bands of 12 CD 3 F have been recorded and deconvolved to ∼0.005 cm −1 resolution. More than 1890 transitions have been assigned to one of the 37 subbands (−18≤ K Δ K ≤+18) comprising the spectrum of the ν 4 band with a maximum assigned J value of 41. The weak 2 ν 2 ( A 1 ) band has never been reported in the infrared prior to this work. A total of 358 transitions in K ≤ 8 subbands have been assigned to the 2 ν 2 band. The two bands are members of the 24 interacting state complex of 12 CD 3 F spectra in the 5-μm region. The ν 4 and 2 ν 2 spectra are highly perturbed, exhibiting local and global resonances. Effective parameters of the two bands were obtained by fitting the data in a restricted manner leaving out the obviously perturbed transitions. The effective parameters, the identification of the different resonances affecting the bands, and estimates of some of the coupling constants are reported.