Spectrum Averaged Mid-IR reflectance spectrum of non-irradiated areas of Allende pellet n°2 Spectrum Averaged Mid-IR spectrum of irradiated Allende pellet n°2 ($Ar^+$, fluence $6~10^{15}$ ions.$cm^{-2}$) Spectrum Averaged Mid-IR spectrum of irradiated Allende pellet n°2 ($He^+$, fluence $3~10^{15}$ ions.$cm^{-2}$)