Anionic Species of Fe in Interstellar Dust

Physics

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Scientific paper

A CRYSTAL-FIELD assignment for the 17,500 cm-1 (5700 Å) and 19,700 cm-1 (5100 Å) bands in absorption spectra of Type I supernovae would support the contention that 6 of the 8 prominent supernova bands (and their diffuse interstellar1 wavelength-equivalents) have been ``parcelled'' and assigned correctly to d-d transitions in tetrahedral-Fe3+ and octahedral-Fe3+. It had been assumed earlier that octahedral- and tetrahedral Fe3+ ions are incorporated in the same oxide2 (γ-Fe2O3) or silicate3 (schorlomite) lattice. Here, I point out that interstellar dust may contain anionic species of Fe, namely FeO42- and FeO2-, which are thermally degradable to a likely interstellar material α-Fe2O3. (Absorption bands are designated according to their wavelengths in the May 4 spectrum4 of SN-NGC-4496.)

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