FTIR spectra and rovibrational analysis of the nu(11) band of trans-ClHC=CHF and nu(10) of trans-ClHC=CDF

High-resolution Fourier transform infrared spectra of natural trans-ClHC@CHF and of its isotopologue trans-ClHC@CDF have been recorded in the region between 700 and 1150 cm1 with the purpose to ana- lyze the m11 fundamental of the main species and the m10 of its deuterated compound. Both bands, of sym- metry species A00, present c-type envelope absorptions. Beside the expected features, the K structure of the P(J), Q(J), and R(J) manifolds was resolved and identified; the assignment of the rovibrational transi- tions was extended up to J=92 and Ka =13 for the trans-35ClHC@CHF and up to J=86 and Ka =10 for trans-35ClHC@CDF. More than 2900 and 2700 lines for the main and deuterated species, respectively, were analyzed by a least-squares procedure and reliable spectroscopic molecular parameters were deter- mined for both isotopologues.