CO2 Absorption of Infrared Radiation Around 14.9 Micrometers
Carbon dioxide (CO2) absorbs radiant energy primarily in 4 major bands shown below (Rohde, 2013). The details of absorption for the major band around 15 micrometers are shown above based on extensive laboratory measurements (Rothman et al., 2013). Absorption is along very narrow spectral lines determined by oscillations about each degree of freedom within the structure of the molecule.
Note that CO2 absorbs a very tiny percentage of total radiation from Earth.