High resolution analysis of the FTIR spectra of trifluoroamine NF3

We report high resolution Fourier Transform Infrared (FTIR) spectra of nitrogen trifluoride (trifluoroamine, NF3) measured with the Zurich Bruker prototype spectrometer (ZP 2001) and the SLS THz/FTIR setup (2009 prototype) in the range 20–3000 cm - 1 at temperatures between 80 and 120 K using a collisional cooling cell designed with White cell multipath reflection optics and at room temperature (296 K). Except in the far-infrared with instrument limited resolution ( Δ ν FWHM = 0.0008 cm - 1 ) many of the spectra are nearly Doppler limited. Rovibrational transitions were assigned to 13 different vibrational bands and were used then in the fitting procedure. We re-investigated the bands 2 ν 4 , ν 1 , ν 2 + ν 4 , ν 1 + ν 4 , 2 ν 3 and ν 1 + ν 3 , which had been studied before, and we have analyzed the ν 2 + ν 3 , 2 ν 1 , ν 1 + ν 2 + ν 4 , ν 1 + ν 2 + ν 3 , ν 2 + 2 ν 3 , 3 ν 3 , ν 1 + 2 ν 3 bands for the first time. All our analyses refer to the isotopomer 14 NF3.