Abstract

Concentrations of impurities in impact diamonds (IDs) from the Popigai meteorite crater reach hundreds of parts per million and are orders of magnitude greater than those in synthetic high-pressure high-temperature diamonds. IDs belong to six groups according to photoluminescence (PL) spectra. Diamonds of groups 1 and 2, consisting of cubic and hexagonal polytypes and sometimes graphite, show PL in broad 570–620 nm bands with unusual zero-phonon lines in the near-IR range, as well as very broad Raman lines. PL spectra of other groups are dominated by signals from nitrogen-vacancy complexes well known for kimberlite diamonds: some of them are related to radiation damage products. Variations in PL spectra are related to considerable difference in grain sizes: broadband shift to longer wavelengths and narrower lines correspond to coarser grain sizes.

© 2016 Optical Society of America

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Supplementary Material (1)

NameDescription
» Data File 1: CSV (4 KB)      Impurity concentrations.

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