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We present a comparison of theoretical and experimental absorption cross sections of perfluorotributylamine (PFBAm). PFBAm is a fully-fluorinated liquid commonly used in electronic reliability and quality testing. PFBAm vapours can be considered potential greenhouse gases due being radiatively active in the mid-IR spectral region and having a long atmospheric lifetime. Theoretical density functional theory (DFT) calculations are done using the B3LYP method and the 6-311G(d,p) basis set. The calculations have determined the optimized geometrical configuration and IR intensities and wavenumbers of the harmonic frequencies for both PFBAm (N(CF2CF2CF2CF3)3) and its congener (F3CN(CF2CF2CF2CF3)2). \ Experimental cross sections are derived from Fourier transform spectroscopy performed from 600-1450 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ at a resolution of 0.02 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ for a temperature range of 273-296 K. These experimental results are compared to our theoretical calculations and both are compared to previous measurements of PFBAm made at room temperature by Young \textit{et al}.