Extended Data Fig. 3: Peak position and shape comparation of intensity normalized Fe L2,3 EELS spectra of metallic Fe0, olivine, and hematite. | Nature Astronomy

Extended Data Fig. 3: Peak position and shape comparation of intensity normalized Fe L2,3 EELS spectra of metallic Fe0, olivine, and hematite.

From: Ubiquitous and progressively increasing ferric iron content on the lunar surfaces revealed by the Chang’e-5 sample

Extended Data Fig. 3

The Fe0 and Fe2+ have a typical Fe L3 peak positions at 708.1–708.9 eV while the Fe3+ has a typical Fe L3 peak position at 709.9 eV. The normalized intensity of the peak tail of Fe0 at 730 eV is 2 times higher than those of Fe2+ and Fe3+. The full width at half maximum (FWHM) of Fe0 L3 peak (3.9 eV) is larger than those of Fe2+ and Fe3+ L3 peaks (~3.4 eV). The green arrow indicates the high-tail feature of Fe L-edge for metallic Fe0, while the orange arrow indicates the relative low-tail features of Fe L-edges for both olivine and hematite.

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