Abstract
Recent studies suggest that the 4430 A diffuse interstellar band represents the crystal-field field-independent transition 6A1⇐4A1E(G) in octahedral-Fe3+ ions located in oxide or Si-substituted silicate lattices1–3, with intensity considerations favouring the former (as α or γ-Fe2O3). Here, I point out that the 4430 A band halfwidth and a Racah B parameter calculated from the separation of absorption bands in spectra of type I supernovae, when interpreted in light of next-nearest neighbour interactions in terrestrial minerals, are not-inconsistent indicators of the presence of ferric oxides, possibly haematite (α-Fe2O3).
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
