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Representative normalized Raman spectra of N species in silicate glasses and metal alloys of samples HB01, HB3, and A05: (A) N2 isotopomers in silicate glasses, (B) NH complexes in silicate glasses, and (C) Fe–N bonds in metal alloys. The Raman shifts of N species are significantly different depending on speciation (N2 versus NH complexes) and whether N is dissolved in metal alloy or silicate glass. Details of our Raman analysis are presented in SI Appendix, section S1.
