Reflection-absorption IR (RAIR) spectra of carbon dioxide (CO2) thin crystalline films at 7 K in the region of fundamental ν3 and ν2 modes were studied. The Davydov splitting (DS) (or factor group splitting) on the fundamental bands were studied. The calculation of the DS was provided in the framework of resonant dipole-dipole (RDD) interaction. The shifts of the TO-branch due to DS were calculated for the ν3 and ν2 bands. In case of the ν3 band, the results obtained are in qualitative and quantitative agreement within 0.1 cm–1. For the ν2 band, the calculated splitting value is 15% greater than the experimental value.