Origin of broad interstellar feature at 1.6 µm-1

Details Origin of broad interstellar feature at 1.6 µm-1 Origin of broad interstellar feature at 1.6 µm-1

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975natur.255...40m&link_type=abstract

Nature, Volume 255, Issue 5503, pp. 40-41 (1975).

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DIFFUSE interstellar absorption bands at 4,430, 4,760, 4,890 and 6,180 Å have been assigned to crystal-field transitions of octahedrally and tetrahedrally bonded ferric ions in an iron oxide1-3. The optical absorption spectra of terrestrial iron bearing minerals4-6 often comprise, in addition to the crystal-field bands, a broad absorption (half-width 3,000 cm-1) in the range 14,000-18,500 cm-1 (715-540 nm) marking Fe2+3dt2 --> Fe3+3dt2 intervalence charge transfer, the cations being located at the centres of adjacent edge-sharing octahedra. Here, I suggest that a discontinuity at ~ 1.6 µm-1, which I see as a minor feature on the mean extinction curve7 for several reddened stars, represents Fe2+-->Fe3+ charge transfer absorption in interstellar grains. A shallow emission feature observed at ~ 1.8 µm-1 in the reddening curve for another group of stars has been interpreted8 as a dip lying between two absorptions centred at ~ 1.5 and ~ 2.4 µm-1.

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