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This first X-ray Photoelectron Spectroscopy (XPS) study of loellingite (FeAs 2 ) reveals a strong Fe 2p 3/2  singlet peak at 707.0 eV signifying that fully coordinated Fe of the bulk phase has the same oxidation state of bulk Fe in marcasite, arsenopyrite, and pyrite. The As 3d peak of loellingite (41.1 eV) demonstrates that As atoms of As dimers in loellingite have the same oxidation state as As atoms of As-S dimers in arsenopyrite. These XPS data consequently corroborate previous Mössbauer studies and confirm theoretical considerations; Fe of loellingite, arsenopyrite, and marcasite is divalent (formally) rather than being trivalent (arsenopyrite) or tetravalent (loellingite). Arsenic is present as As 1-  (formal oxidation state) in both loellingite and arsenopyrite.

XPS evidence for Fe and As oxidation states and electronic states in loellingite (FeAs 2 )