Abstract
The volumetric concentration of hydrogen in two Brazilian diamonds is determined using secondary ion mass spectrometry and implantation of hydrogen into an external standard sample (with a dose of 1 × 16 at/cm2 and energy of 120 KeV). The diamonds studied differ noticeably in their intensities of IR-active hydrogen from 0 to 1.5 cm–1 according to the analyses of their IR spectra. The results demonstrate that for both samples studied, the volumetric concentration of hydrogen does not exceed the reached detectable level of (1–2) × 1018 at/cm3 or 1.7–3.3 at. ppm; i.e., it is lower by an order of magnitude than in the early chemical analysis and by 2–3 orders of magnitude lower than the results of the ion-beam spectrochemical, nuclear-physical, and ERDA analyses. Only a part of the hydrogen forms optically active impurities in diamond crystals and can be determined by spectral methods.
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ACKNOWLEDGMENTS
The authors are grateful to G.K. Khachatryan for performing the IR-spectral analysis of diamonds, to L.N. Kogarko, V.S. Sevast’yanov, and A.A. Shiryaev for discussion of the results and helpful advice, as well as to two anonymous reviewers whose comments contributed to the improvement of the text and the figures of this work.
Funding
The studies by the SIMS method were carried out using the equipment of the Center for Collective Use for Material Science and Diagnostics in Advanced Technologies (Ioffe Physical-Technical Institute) supported by the Ministry of Science and Higher Education of the Russian Federation (the unique project identifier RFMEFI62119X0021).
This work was supported by the Ministry of Science and Higher Education of the Russian Federation (project no. 2020-1902-01-258).
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Translated by L. Mukhortova
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Kaminsky, F.V., Shilobreeva, S.N., Ber, B.Y. et al. Quantification of Hydrogen in Natural Diamond by Secondary Ion Mass Spectrometry (SIMS). Dokl. Earth Sc. 494, 699–703 (2020). https://doi.org/10.1134/S1028334X20090093
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DOI: https://doi.org/10.1134/S1028334X20090093