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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">geology</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Геология и разведка</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of higher educational establishments. Geology and Exploration</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0016-7762</issn><issn pub-type="epub">2618-8708</issn><publisher><publisher-name>Sergo Ordzhonikidze Russian State University for Geological Prospecting</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32454/0016-7762-2020-63-5-67-76</article-id><article-id custom-type="elpub" pub-id-type="custom">geology-706</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МИНЕРАЛОГИЯ, ПЕТРОГРАФИЯ, ЛИТОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MINERALOGY, PETROGRAPHY, LITHOLOGY</subject></subj-group></article-categories><title-group><article-title>Необычные оптические центры в фантазийных коричневых алмазах</article-title><trans-title-group xml:lang="en"><trans-title>Unusual optical centres in fancy brown diamonds</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9440-7052</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дорофеева</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Dorofeeva</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>младший научный сотрудник</p><p>35, Старомонетный пер., г. Москва 119017, РоссияSPIN-код: 4895-8965</p></bio><bio xml:lang="en"><p>associate researcher</p><p>35, Staromonetny lane, Moscow 119017, RussiaSPIN-code: 4895-8965</p></bio><email xlink:type="simple">adorofeevawork@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4275-9643</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Титков</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Titkov</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор геолого-минералогических наук, ведущий научныйсотрудник; профессор кафедры минералогии и геммологии геологоразведочного факультета </p><p>35, Старомонетный пер., г. Москва 119017, Россия</p><p>23, Миклухо-Маклая ул., г. Москва 117997, РоссияSPIN-код: 1111-5626</p></bio><bio xml:lang="en"><p>Dr. of Sci. (Geol. and Mineral.), leading researcher; Professor of the Department of Mineralogy and  Gemmology, Geological Prospecting Faculty</p><p>35, Staromonetny lane, Moscow 119017, Russia</p><p>23, Miklukho-Maklaya str., Moscow 117997, RussiaSPIN-code: 1111-5626</p></bio><email xlink:type="simple">titkov@igem.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБУН «Институт геологии рудных месторождений, петрографии, минералогии и геохимии Российской академии наук»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Geology of Ore Deposits, Petrography,  Mineralogy, and Geochemistry of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФГБУН «Институт геологии рудных месторождений, петрографии, минералогии и геохимии Российской академии наук»;&#13;
 ФГБОУ ВО «Российский государственный геологоразведочный университет им. С. Орджоникидзе»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry of the Russian Academy of Sciences;&#13;
Sergo Ordzhonikidze Russian State University for Geological Prospecting</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>30</day><month>08</month><year>2021</year></pub-date><volume>63</volume><issue>5</issue><fpage>67</fpage><lpage>76</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Дорофеева А.И., Титков С.В., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Дорофеева А.И., Титков С.В.</copyright-holder><copyright-holder xml:lang="en">Dorofeeva A.I., Titkov S.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.geology-mgri.ru/jour/article/view/706">https://www.geology-mgri.ru/jour/article/view/706</self-uri><abstract><p>Введение. Природные коричневые алмазы с фантазийными желтым, оранжевым, красным и зеленым оттенками являются ценным ювелирным сырьем. Их окраска связана с посткристаллизационной пластической деформацией, испытанной в процессе транспортировки из мантии к поверхности Земли.Цель — изучение точечных дефектов в пластически деформированных алмазах с использованием методов оптической спектроскопии и ИК-спектроскопии.Материалы и методы. Проведены спектроскопические исследования ограненных коричневых алмазов фантазийных оттенков, представленных на российском рынке. Отобранные образцы были изучены с использованием оптической спектроскопии поглощения в УФ-видимой области и ИК-спектроскопии.Результаты. В спектрах поглощения УФ-видимой области изученных алмазов наряду с известным континуумом непрерывного поглощения, возрастающего от красной к ультрафиолетовой области спектра, и азотными центрами N3, H3 и 550 нм были выявлены необычные оптические центры. В спектрах желтовато-коричневых алмазов были обнаружены линии 512,9 и 519,9 нм и сопровождающая их широкая полоса с максимумом 480 нм. C этими оптическими центрами связано появление желтоватого оттенка кристаллов. В спектре оранжевато-коричневого алмаза были установлены линии 506,5, 516,1 и 679,7 нм. В зеленовато-коричневом алмазе наблюдались дополнительный континуум поглощения, связанный с одиночными атомами азота, и центры (NV)–. Их одновременное присутствие вызывает появление зеленоватого оттенка в окраске алмаза.Заключение. Оптические центры, вызывающие фантазийные оттенки у природных коричневых алмазов, весьма разнообразны.</p></abstract><trans-abstract xml:lang="en"><p>Background. Natural brown diamonds with fancy yellow, orange, red and green tints are valuable jewelry raw materials. Their colour is associated with post-crystallisation plastic deformation occurring during transportation from the mantle to the Earth’s surface.Aim. To study point defects in plastically deformed diamonds using optical and IR spectroscopy.Materials and methods. Faceted brown diamonds with fancy tints presented on the Russian market were studied spectroscopically. Selected samples were examined using UV-visible optical absorption spectroscopy and IR spectroscopy.Results. We discovered unusual optical centres in the absorption spectra of the UV-visible region. In addition, the known continuous absorption increasing from the red to the ultraviolet region of the spectrum, as well as the N3 and H3 nitrogen centres and a band at 550 nm, were revealed. In the spectra of yellowish-brown diamonds, the bands at 512.9 nm and 519.9 nm and an accompanying broad band with a maximum of 480 nm were found. The appearance of a yellowish tint of crystals was associated with these optical centres. The bands 506.5 nm, 516.1 nm and 679.7 nm were established in the spectrum of orange-brown diamond samples. An additional absorption continuum associated with single nitrogen atoms and centres (NV)– were observed in greenish-brown diamond samples. Their simultaneous presence causes the appearance of a greenish tint in the diamond colour.Conclusion. The information obtained using IR spectroscopy indicates that an intense brown colour can occur not only in the most common Ia type crystals according to the physical classification of diamonds, but also in relatively rare Ib + IaA type diamonds.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>природные алмазы</kwd><kwd>коричневая окраска</kwd><kwd>оптические центры</kwd><kwd>азотные примеси</kwd><kwd>пластическая деформация</kwd><kwd>спектроскопия поглощения в УФ-видимой области</kwd><kwd>ИК-спектроскопия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>natural diamonds</kwd><kwd>brown colour</kwd><kwd>optical centres</kwd><kwd>nitrogen impurities</kwd><kwd>plastic deformation</kwd><kwd>UV-visible absorption spectroscopy</kwd><kwd>IR spectroscopy</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в соответствии с госзаданием по теме 0136-2018- 0011 ИГЕМ РАН.</funding-statement><funding-statement xml:lang="en">The work was performed in accordance with the state task on the topic 0136-2018-0011 of IGEM RAS.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Зинчук Н.Н., Коптиль В.И. 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