High-resolution infrared spectroscopy of the ν2=ν6= 1 combination level of DCF3

The degenerate combination level ν 2 = ν 6 = 1 (1611.84 cm −1 , E symmetry) of DCF 3 was investigated with high-resolution using a Fourier-transform infrared spectra. They were recorded in the regions of the combination band between 1550 and 1650 cm −1 and the corresponding hot band ν 2 + ν 6 − ν 6 between 1070 and 1150 cm −1 . The analysis justifies the use of an isolated vibrational level model which yields a fully quantitative reproduction of all assigned experimental data.