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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-270</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>***</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>***</subject></subj-group></article-categories><title-group><article-title>ИЗУЧЕНИЕ ТЕРАГЕРЦОВЫХ СПЕКТРОВ КРИСТАЛЛИЧЕСКИХ МАТЕРИАЛОВ (ПОЛИЭТИЛЕНA, ПОЛИВИНИЛИДИНA ФЛУОРИДA ФОРМЫ II И a-D-ГЛЮКОЗЫ) С ИСПОЛЬЗОВАНИЕМ ПОЛУЭМПИРИЧЕСКИХ МЕТОДОВ NDDO</article-title><trans-title-group xml:lang="en"><trans-title>A STUDY OF THE TERAHERTZ SPECTRA OF CRYSTALLINE MATERIALS (POLYETHYLENE, POLY(VINYLIDENE FLUORIDE) FORM II, AND a-D-GLUCOSE) USING NDDO SEMIEMPIRICAL METHODS</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>Chamorro-Posada</surname><given-names>P. .</given-names></name><name name-style="western" xml:lang="en"><surname>Chamorro-Posada</surname><given-names>P. .</given-names></name></name-alternatives><email xlink:type="simple">pedcha@tel.uva.es</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Вальядолидский университет</institution></aff><aff xml:lang="en"><institution>Universidad de Valladolid, ETSI Telecomunicación</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>10</day><month>03</month><year>2020</year></pub-date><volume>85</volume><issue>3</issue><elocation-id>516(1)-516(8)</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Chamorro-Posada P..., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Chamorro-Posada P...</copyright-holder><copyright-holder xml:lang="en">Chamorro-Posada P...</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/270">https://zhps.ejournal.by/jour/article/view/270</self-uri><abstract><p>C использованием гамильтонианов PM6 и PM7 изучены моды низкочастотных колебаний трех кристаллических материалов (полиэтилена, поливинилидина флуорида формы II и a-D-глюкозы) с целью оценки эффективности методов NDDO при интерпретации терагерцовых спектров. Результаты сопоставлены с имеющимися экспериментальными данными и предыдущими расчетами, выполненными альтернативными методами. Расчеты NDDO находятся в хорошем качественном или полуколичественном согласии с экспериментальными терагерцовыми спектрами. </p></abstract><trans-abstract xml:lang="en"><p>Semiempirical quantum chemistry methods offer a very interesting compromise between accuracy and computational complexity. The low frequency vibration modes of three crystalline materials, namely, polyethylene, poly(vinylidene fluoride) form II, and a-D-glucose, have been studied using the PM6 and PM7 Hamiltonians in order to assess the performance of NDDO methods in the interpretation of terahertz spectra. The results have been compared with the available experimental data and former calculations performed using alternative methods. NDDO calculations are in good qualitative or semiquantitative agreement with the experimentally observed terahertz spectra. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>терагерцовая спектроскопия</kwd><kwd>квантовая химия</kwd><kwd>полуэмпирические методы</kwd><kwd>пренебрежение двухатомным дифференциальным перекрытием (NDDO)</kwd><kwd>terahertz spectroscopy</kwd><kwd>quantum chemistry</kwd><kwd>semiempirical methods</kwd><kwd>NDDO</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Terahertz Spectroscopy and Imaging, Eds. K.-E. Peiponen, J. A. Zeitler, M. Kuwata-Gonokami, Springer, Heildelberg (2013).</mixed-citation><mixed-citation xml:lang="en">Terahertz Spectroscopy and Imaging, Eds. K.-E. Peiponen, J. A. Zeitler, M. 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