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

► The ν2 + ν6 level is one of the four vibrational levels of DCF3 between 1600 and 1700 cm−1. ► Analyzed from FTIR spectra of the combination and hot bands. ► The isolated vibrational level approach provides a fully quantitative reproduction of data.