Felix V. Kaminsky , Veniamin B. Polyakov , Boris Ya. Ber , Dmitry Yu. Kazantsev , Galina K. Khachatryan , Svetlana N. Shilobreeva
{"title":"Hydrogen in natural diamond: Quantification of N3VH defects using SIMS and FTIR data","authors":"Felix V. Kaminsky , Veniamin B. Polyakov , Boris Ya. Ber , Dmitry Yu. Kazantsev , Galina K. Khachatryan , Svetlana N. Shilobreeva","doi":"10.1016/j.chemgeo.2024.122185","DOIUrl":null,"url":null,"abstract":"<div><p>A set of ten diamonds from different sources representing the main types of physical classification (IaA, IaAB, IaB and IIa) has been first explored by FTIR spectroscopy and SIMS calibrated by hydrogen ion implantation. The concentrations of hydrogen in the studied diamonds measured by SIMS range between 9.98 and 47.6 at.ppm or from 1.76 × 10<sup>18</sup> to 8.40 × 10<sup>18</sup> at./cm<sup>3</sup>. The 3107 cm<sup>−1</sup> absorption line has been detected by FTIR spectroscopy (resolution near 1 cm<sup>−1</sup>) in five studied diamonds (IaB and IaAB). The 3107 cm<sup>−1</sup> IR absorption lines due to H defects in these diamonds have been successfully described by the Lorentzian shape and their parameters have been evaluated. Based on the linear regression equation relating intensities of the 3107 cm<sup>−1</sup> IR absorption lines in the studied diamonds with their H defect concentrations, the H defect IR absorption at 3107 cm<sup>−1</sup> in diamond has been quantified. The absorption calibration constant for diamond's 3107 cm<sup>−1</sup> absorption line is 386 ± 64 ppb cm<sup>2</sup>. The corresponding cross-section per one H defect <em>σ</em><sub>3107</sub> (cm<sup>2</sup>) = (9.34 ± 1.25) × 10<sup>−18</sup> /<em>Γ</em> (cm<sup>−1</sup>), <em>Γ</em> is the full width at half maximum (FWHM) of the 3107 cm<sup>−1</sup> absorption line. Based on a widely accepted interpretation that the H defect resulting in the 3107 cm<sup>−1</sup> IR absorption peak in diamonds is the N<sub>3</sub>VH defect, the values of the obtained calibration constant and cross-section have been assigned to the N<sub>3</sub>VH defect in diamond. The equations relating concentration of the N<sub>3</sub>VH defect ([N<sub>3</sub>VH]) with the 3107 cm<sup>−1</sup> IR absorption line integrated intensity (<em>I</em><sub>3107</sub>) and intensity (<em>α</em><sub>3107</sub>) are as follows: [N<sub>3</sub>VH] (ppb) = (386 ± 64) <em>I</em><sub>3107</sub>; [N<sub>3</sub>VH] (ppm) = (0.607 ± 0.080) <em>α</em> <sub>3107</sub> (cm<sup>−1</sup>)<em>Γ</em> (cm<sup>−1</sup>). Hydrogen impurities that do not contribute to the IR absorption at the 3107 cm<sup>−1</sup> peak were detected in all studied diamonds.</p></div>","PeriodicalId":9847,"journal":{"name":"Chemical Geology","volume":null,"pages":null},"PeriodicalIF":3.6000,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Geology","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0009254124002651","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
A set of ten diamonds from different sources representing the main types of physical classification (IaA, IaAB, IaB and IIa) has been first explored by FTIR spectroscopy and SIMS calibrated by hydrogen ion implantation. The concentrations of hydrogen in the studied diamonds measured by SIMS range between 9.98 and 47.6 at.ppm or from 1.76 × 1018 to 8.40 × 1018 at./cm3. The 3107 cm−1 absorption line has been detected by FTIR spectroscopy (resolution near 1 cm−1) in five studied diamonds (IaB and IaAB). The 3107 cm−1 IR absorption lines due to H defects in these diamonds have been successfully described by the Lorentzian shape and their parameters have been evaluated. Based on the linear regression equation relating intensities of the 3107 cm−1 IR absorption lines in the studied diamonds with their H defect concentrations, the H defect IR absorption at 3107 cm−1 in diamond has been quantified. The absorption calibration constant for diamond's 3107 cm−1 absorption line is 386 ± 64 ppb cm2. The corresponding cross-section per one H defect σ3107 (cm2) = (9.34 ± 1.25) × 10−18 /Γ (cm−1), Γ is the full width at half maximum (FWHM) of the 3107 cm−1 absorption line. Based on a widely accepted interpretation that the H defect resulting in the 3107 cm−1 IR absorption peak in diamonds is the N3VH defect, the values of the obtained calibration constant and cross-section have been assigned to the N3VH defect in diamond. The equations relating concentration of the N3VH defect ([N3VH]) with the 3107 cm−1 IR absorption line integrated intensity (I3107) and intensity (α3107) are as follows: [N3VH] (ppb) = (386 ± 64) I3107; [N3VH] (ppm) = (0.607 ± 0.080) α3107 (cm−1)Γ (cm−1). Hydrogen impurities that do not contribute to the IR absorption at the 3107 cm−1 peak were detected in all studied diamonds.
期刊介绍:
Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry.
The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry.
Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry.
The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.