Evolution of the CO₂ ν₃ band area while irradiating CaCO₃ at different temperatures and electron fluxes. Areas of the 4.25 μm (red) and 4.27 μm (blue) components, as well as their sums (black), are shown. Errors are within 0.001 μm. In all cases, the band area increases rapidly and then levels off. Total CO₂ yield follows the trend 50 K/high flux > 50 K/low flux > 100 K > 120 K. The 4.27 μm component is the major contributor to the band area.