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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Himičeskaâ fizika</journal-id><journal-title-group><journal-title xml:lang="en">Himičeskaâ fizika</journal-title><trans-title-group xml:lang="ru"><trans-title>Химическая физика</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0207-401X</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">674815</article-id><article-id pub-id-type="doi">10.31857/S0207401X23100035</article-id><article-id pub-id-type="edn">RMPETI</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>Элементарные физико-химические процессы</subject></subj-group><subj-group subj-group-type="article-type"><subject>Unknown</subject></subj-group></article-categories><title-group><article-title xml:lang="en">ФРАГМЕНТАЦИЯ МОЛЕКУЛ АДЕНИНА ПРИ ВЗАИМОДЕЙСТВИИ С ИОНАМИ</article-title><trans-title-group xml:lang="ru"><trans-title>Фрагментация молекул аденина при взаимодействии с ионами</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Basalaev</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Басалаев</surname><given-names>А. А.</given-names></name></name-alternatives><email>a.basalaev@mail.ioffe.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuz’michev</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Кузьмичев</surname><given-names>В. В.</given-names></name></name-alternatives><email>a.basalaev@mail.ioffe.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Panov</surname><given-names>M. N.</given-names></name><name xml:lang="ru"><surname>Панов</surname><given-names>М. Н.</given-names></name></name-alternatives><email>a.basalaev@mail.ioffe.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Simon</surname><given-names>K. V.</given-names></name><name xml:lang="ru"><surname>Симон</surname><given-names>К. В.</given-names></name></name-alternatives><email>a.basalaev@mail.ioffe.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Smirnov</surname><given-names>O. V.</given-names></name><name xml:lang="ru"><surname>Смирнов</surname><given-names>О. В.</given-names></name></name-alternatives><email>a.basalaev@mail.ioffe.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia</institution></aff><aff><institution xml:lang="ru">Физико-технический институт им. А.Ф. Иоффе Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-10-01" publication-format="electronic"><day>01</day><month>10</month><year>2023</year></pub-date><volume>42</volume><issue>10</issue><fpage>16</fpage><lpage>25</lpage><history><date date-type="received" iso-8601-date="2025-02-28"><day>28</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, А.А. Басалаев, В.В. Кузьмичев, М.Н. Панов, К.В. Симон, О.В. Смирнов</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, А.А. Басалаев, В.В. Кузьмичев, М.Н. Панов, К.В. Симон, О.В. Смирнов</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">А.А. Басалаев, В.В. Кузьмичев, М.Н. Панов, К.В. Симон, О.В. Смирнов</copyright-holder><copyright-holder xml:lang="ru">А.А. Басалаев, В.В. Кузьмичев, М.Н. Панов, К.В. Симон, О.В. Смирнов</copyright-holder></permissions><self-uri xlink:href="https://transsyst.ru/0207-401X/article/view/674815">https://transsyst.ru/0207-401X/article/view/674815</self-uri><abstract xml:lang="en"><p>The mechanism of the fragmentation processes of adenine ions (Ade, C5H5N5) occurring during the interaction of molecules in the gas phase with ions energies of the order of keV is studied. The relative cross sections of various elementary processes occurring in single collisions of ions with molecules are measured. The channels of the fragmentation processes of singly charged Ade+ ions are experimentally studied. The complete active space self-consistent field (CASSCF) method is used to calculate the geometry of the molecules and singly charged Ade+ ions, as well as the reaction paths of the main experimentally observed fragmentation channels of these ions.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181325592304">Исследован механизм процессов фрагментации ионов аденина (Ade, C<sub>5</sub>H<sub>5</sub>N<sub>5</sub>), происходящих при взаимодействии молекул, находящихся в газовой фазе, с ионами энергий порядка кэВ. Измерены относительные сечения различных элементарных процессов, осуществляющихся при однократных столкновениях ионов с молекулами. Экспериментально изучены каналы процессов фрагментации однозарядных ионов Ade<sup>+</sup>. Методом самосогласованного поля в полном активном пространстве <bold>(</bold>CASSCF) выполнен расчет геометрии молекул и однозарядных ионов Ade<sup>+</sup>, а также путей реакций основных экспериментально наблюдаемых каналов фрагментации этих ионов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>electron capture</kwd><kwd>adenine</kwd><kwd>fragmentation of molecular ions</kwd><kwd>mass spectrometry</kwd><kwd>CASSCF method</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>захват электронов</kwd><kwd>аденин</kwd><kwd>фрагментация молекулярных ионов</kwd><kwd>масс-спектрометрия</kwd><kwd>метод CASSCF.</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Lin J., Yu C., Peng S. I. Akiyama et al. // J. Amer. Chem. Soc. 1980. V. 102. P. 4627.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Urano S., Yang X., LeBreton P.R. // J. Mol. Struct. 1989. V. 214. 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