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-CIHC=CHF and of its isotopologue trans-CIHC=CDF have been recorded in the region between 700 and 1150 cm(-1) with the purpose to analyze the nu(11) fundamental of the main species and the nu(10) of its deuterated compound. Both bands, of symmetry species A", 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 transitions was extended up to J = 92 and K-a = 13 for the trans(-35)ClHC=CHF and up to J = 86 and K-a = 10 for trans(-35)ClHC=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 determined for both isotopologues. (C) 2008 Elsevier Inc. All rights reserved.