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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">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">zhps-719</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Исследование барбитуровой кислоты с использованием терагерцовой спектроскопии и молекулярного моделирования</article-title><trans-title-group xml:lang="en"><trans-title>Terahertz spectroscopy and molecular modeling of barbituric acid</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Zheng</surname><given-names>Zh.</given-names></name><name name-style="western" xml:lang="en"><surname>Zheng</surname><given-names>Zh.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сиань 710121.</p></bio><bio xml:lang="en"><p>Xi'an 710121.</p></bio><email xlink:type="simple">zhengzhuanp@xupt.edu.cn</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Li</surname><given-names>Ch.</given-names></name><name name-style="western" xml:lang="en"><surname>Li</surname><given-names>Ch.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сиань 710121.</p></bio><bio xml:lang="en"><p>Xi'an 710121.</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Dong</surname><given-names>J.</given-names></name><name name-style="western" xml:lang="en"><surname>Dong</surname><given-names>J.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сиань 710121.</p></bio><bio xml:lang="en"><p>Xi'an 710121.</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Zhou</surname><given-names>Sh.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhou</surname><given-names>Sh.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сиань 710121.</p></bio><bio xml:lang="en"><p>Xi'an 710121.</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Школа электронной инженерии Сианьского университета почты и телекоммуникаций</institution></aff><aff xml:lang="en"><institution>School of Electronic Engineering at Xi'an University of Posts&amp;Telecommunication</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>27</day><month>11</month><year>2020</year></pub-date><volume>87</volume><issue>6</issue><fpage>867</fpage><lpage>872</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Zheng Z., Li C., Dong J., Zhou S., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Zheng Z., Li C., Dong J., Zhou S.</copyright-holder><copyright-holder xml:lang="en">Zheng Z., Li C., Dong J., Zhou S.</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://zhps.ejournal.by/jour/article/view/719">https://zhps.ejournal.by/jour/article/view/719</self-uri><abstract><p>С помощью терагерцовой спектроскопии во временной области исследован спектр ТГц-поглощения барбитуровой кислоты. В диапазоне 10-124 см-1 наблюдались четыре отчетливые спектральные терагерцовые особенности и два плечевых пика. Полный анализ выполнен с помощью теории функционала плотности, которая обеспечила согласие между твердотельным моделированием и экспериментом. Показано, что шесть экспериментальных спектральных особенностей, наблюдаемых при низкой температуре, состоят из девяти ИК активных колебательных мод. Дальнейшее моделирование на основе изотопов водородных связей выполнено для изучения участия водородных связей в коллективных модах. Особенность при 118.0 см-1 в основном связана с коллективным колебанием водородных связей димера (m), в то время как при 102.0 и 109.6 см-1 — с коллективными колебаниями линейных водородных связей (n). Результаты могут быть полезны для мониторинга молекулярной реакции в промышленном производстве по состоянию водородных связей.</p></abstract><trans-abstract xml:lang="en"><p>The well-resolved terahertz (THz) absorption spectrum of barbituric acid has been investigated using terahertz time-domain spectroscopy. Four distinct THz spectral features and two shoulder peaks were observed in the range of 10-124 cm-1. A complete analysis was performed with density functional theory, which provided an excellent agreement between solid-state simulation and experiment. The solid-state analysis indicates that the six experimental spectral features observed at low temperature consist of nine infrared-active vibrational modes. Further simulations based on hydrogen-bond isotopologues were performed to study the involvement of hydrogen bonds in the collective modes. A feature at 118.0 cm-1 mainly stems from the collective vibration of dimer hydrogen bonds (m) while features at 102.0 and 109.6 cm-1 primarily come from the collective vibrations of linear hydrogen bonds (n). The results may be useful for monitoring molecular reaction in industrial production according to the state of hydrogen bonds.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>терагерцовая спектроскопия во временной области</kwd><kwd>моделирование</kwd><kwd>барбитуровая кислота</kwd><kwd>теория функционала плотности</kwd><kwd>водородная связь</kwd></kwd-group><kwd-group xml:lang="en"><kwd>terahertz time-domain spectroscopy</kwd><kwd>simulation</kwd><kwd>barbituric acid</kwd><kwd>density functional theory</kwd><kwd>hydrogen bond</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the National Science Foundation for Young Scientists of China (Grant No. 11604263) and the education department of Shaanxi Province (Grant No. 16JK1698).</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">D. Dragoman, M. Dragoman, Prog. 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