FTIR spectra. (a) Unirradiated and D⁺-irradiated olivine. (b) Unirradiated and D⁺-irradiated pyroxene. (c) Unirradiated and D⁺-irradiated plagioclase. (d, e, and f) Difference (D⁺-irradiation minus unirradiated) between a D⁺-irradiation spectrum and an unirradiated spectrum in olivine, pyroxene, and plagioclase, respectively. (g, h, and i) FTIR spectra of the reference blank unirradiated region in each sample, taken before and after the experiment. Panels (g, h, and i) show that the changes in the spectra shown in panels (a, b, and, c) result from the D implantation rather than environmental conditions.