The infrared spectra of CF3CH2F, CF3CH2Cl, CF3CH2Br, and CF3CH2I in the vapor and solid phase have been obtained, and normal coordinate calculations on the chlorine and bromine molecules have been carried out. From this study it has been possible to correct the previous assignments of vibrational fundamentals for these molecules.
D. F. Harnish and R. P. Hirschmann, "Vibrational Fundamentals of CF3CH2X Molecules," Appl. Spectrosc. 24, 28-35 (1970)