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Scientific paper
Nov 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970natur.228..844m&link_type=abstract
Nature, Volume 228, Issue 5274, pp. 844-845 (1970).
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2
Scientific paper
THE visible-region crystal-field spectra of Fe2+ and Fe3+ ions located in silicate minerals show several similar features, in particular a number of relatively sharp bands marking field-independent transitions, which are difficult to assign unless attendant chemical analyses are available. Three absorption bands at 6200 Å, 4430 Å and 3800 Å in optical spectra of Type I supernova were recently assigned1,2 to transitions within octahedral Fe3+ ions in andradite garnet, while two other bands at 5100 Å (19,600 cm-1) and 5700 Å (17,500 cm-1) were attributed to Fe2+ ions in almandine garnet. Runciman3 also feels that the supernova bands are due mainly to Fe, but he suggests that they may mark transitions in Fe2+ ions in pyroxene minerals. Many stars have appreciable excess emission at 10 and 20 µm, the origin of which has been attributed to circumstellar silicates4-7, possibly orthopyroxenes and olivines.
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