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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="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Physical Chemistry A</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Physical Chemistry A</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал физической химии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-4537</issn><issn publication-format="electronic">3034-5537</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">685272</article-id><article-id pub-id-type="doi">10.31857/S0044453725020099</article-id><article-id pub-id-type="edn">DDUMMO</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>CHEMICAL KINETICS AND CATALYSIS</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ХИМИЧЕСКАЯ КИНЕТИКА И КАТАЛИЗ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Influence of environment and intramolecular vibrations on the kinetics of occupancy of the triplet state of the donor molecule</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние среды и внутримолекулярных колебаний на кинетику заселения триплетного состояния молекулы-донора</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Minakova</surname><given-names>E. N.</given-names></name><name xml:lang="ru"><surname>Минакова</surname><given-names>Е. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mikhailova.va@volsu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mikhailova</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Михайлова</surname><given-names>Е. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mikhailova.va@volsu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mikhailova</surname><given-names>V. A.</given-names></name><name xml:lang="ru"><surname>Михайлова</surname><given-names>В. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mikhailova.va@volsu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Volgograd State University</institution></aff><aff><institution xml:lang="ru">Волгоградский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-02-15" publication-format="electronic"><day>15</day><month>02</month><year>2025</year></pub-date><volume>99</volume><issue>2</issue><fpage>243</fpage><lpage>250</lpage><history><date date-type="received" iso-8601-date="2025-06-19"><day>19</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0044-4537/article/view/685272">https://journals.eco-vector.com/0044-4537/article/view/685272</self-uri><abstract xml:lang="en"><p>Within the framework of the stochastic approach, a numerical study of the kinetics of occupancy of the triplet state of an electron donor molecule caused by photoinduced electron transfer from the donor to the paramagnetic acceptor and back is performed. The conditions are determined, and a general strategy for achieving the maximum efficiency of triplet molecule accumulation induced by the electron transfer is stated. Solvents with fast dielectric relaxation are shown to contribute to increasing the efficiency of the process involved.</p></abstract><trans-abstract xml:lang="ru"><p>В рамках стохастического подхода проведено численное исследование кинетики заселения триплетного состояния молекулы-донора электронов, вызванное фотоиндуцированным переносом электрона с донора на парамагнитный акцептор и обратно. Определены условия и сформулирована общая стратегия достижения максимальной эффективности накопления триплетных молекул, индуцированного переносом электрона. Показано, что растворители с быстрой диэлектрической релаксацией способствуют увеличению эффективности исследуемого процесса.</p></trans-abstract><kwd-group xml:lang="en"><kwd>photoinduced electron transfer</kwd><kwd>nonequilibrium medium</kwd><kwd>triplet states</kwd><kwd>donor-acceptor pairs</kwd><kwd>intramolecular vibrations</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>фотоиндуцированный перенос электрона</kwd><kwd>неравновесность среды</kwd><kwd>триплетные состояния</kwd><kwd>донорно-акцепторные пары</kwd><kwd>внутримолекулярные колебания</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>22-13-00180</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Фотосинтез / Под ред. 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