The nu(2), nu(4)+nu(5), nu(6)+nu(9), and nu(8) band system in 1,1,1-trifluoroethane

High-resolution FTIR spectra of 1,1,1-trifluoroethane (HFC-143a) have been recorded in the region from 1370 to 1470 cm(-1) with an unapodized resoluti on of 0.0016 cm(-1) at room temperature and of 0.004 cm(-1) at 183 and 100 K. The two main infrared active bands of A(1) symmetry have been shown to b e nu(2) at 1407.5 cm(-1) and nu(4) + nu(5) at 1440.5 cm(-1). With the aid o f Raman spectra, the two infrared inactive bands of E symmetry in this spec tra region have been shown to be nu(8) at 1457.5 cm(-1) and nu(6) + nu(9) a t 1446.2 cm(-1). The nu(2) band was analyzed as an isolated band, whereas t he nu(4) + nu(5) band was analyzed as part of the triad nu(4) + nu(5), nu(6 ) + nu(9), and nu(8). (C) 2000 Academic Press.